Designing a Contractor Trailer in SketchUp - 359

Jay Bates
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Jul 16, 2025
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hey folks how you doing hopefully you're
all having a great day today a friend of
mine is a local contractor and asked me
to
create version two of his rolling tool
box right
or his contractor trailer he's a he's a
lifelong contractor always works on site
and has always had a box trailer
pulled behind his truck with his tools
so
there's a lot of design inspiration out
there on the internet one that i want to
point
out specifically is ron polk the awesome
rolling tool box
is his design of a rolling trailer
and i pointed out specifically because
my friend got the idea to use these
viewtainers
which is this rack back here uh from ron
so it's worth giving him credit that
he's inspiring a lot of people to make
some really awesome tooling setups
for people on the go if you're
interested ron paul
does have a set of plans for his
specific design in his
specific trailer this is not for that
specific size
trailer it's quite different as a matter
of fact let me hide everything and i'll
show you the trailer itself
it's this is the top down view this is a
whoops
there's the top down view this is a
horse trailer and some of you might be
thinking
why in the world make a horse trailer
into a rolling tool box
and the answer to that is because he's
got one and because he wants to
so this is the design we're starting
with this is the canvas this is the
footprint
up here is attack room in the front and
there's a door to this side this is kind
of a small space
not really too there's not really much
that can be
greatly designed for it
because he's going to be using it kind
of like a break room he's going to put a
plug-in cooler have a
microwave and stuff to keep the people
stuff to keep
his people on the job rather than
driving off wasting time trying to find
something to eat
so in here is the main storage
area and back up to this top left area
is another door
so we don't need to we need to keep this
open so we don't block this
this and this are two studs in the wall
that were for
aluminum doors or walls i should say
right here
to separate different horses and those
walls have been removed but those studs
are still there so we have to design
around those
we also have two swing out doors down
here to work with and we've designated
this area in front right here you see
this this horizontal bar we've
designated this
as do not add area because uh he wants
to put like ladders in the back side
here possibly
we're just not adding anything right
here so the design
canvas is all of this space
in here and we took this we took these
measurements one morning he he pulled
into my driveway and
five hours later we ended up with
this wireframe model so we had the
trailer to work with as far as
dimensioning stuff out
we had a whole list of notes to work
with as far as his specific
tools his specific needs let me walk you
through our
design and you'll notice this design is
just a wire frame there's no thickness
to any of this
and when you're trying to when i'm
trying to work out a hash out of design
with somebody else
there's no need in spending the time to
to get so specific with joinery and all
the little details that will
actually be in real life all we need is
the major dimensions
and make sure that stuff fits and if
that's the case
all we need for that is a wireframe
model
so in here with doors open this is a
long horizontal slot here that is
i think 52 inches off the ground and
that is 50 inches off the ground for
larger plywood offcuts from jobs that it
can keep on hand for just
random tasks if if the job that he's
working on requires 10 sheets of plywood
that are brand new
well then you can put them here in the
aisle and get to the job and there's no
need in driving around with a massive
amount of storage for plywood so this
isn't that large
down here is a spot for some some tables
or some various other things that he had
he had
in this specific size so one thing to
note real quick
i told him that a couple days prior to
that too to
give me rectangular dimensions of all
the stuff that you wanted
to put in here go ahead and measure all
of your stuff
in a rectangular dimension what is the
the length the width and the height
of a volume of space that this could fit
into
and that's what we use to size all these
components so this is plywood this is
some
staging tables then these are some other
tools that he has underneath this side
over here
this long area right here the top part
is
being suspended right here this is a uh
a walk board eight foot walk board up
here
is for various pieces of trim and longer
offcuts this is kind of like a scrap bin
on the go and for what he does for all
these
random little odd jobs that he does this
is very important to him to have
a location like this for oddball off
cuts
that most other contractors would kind
of throw away
he says if it's less than two feet he
throws it away puts it in a burnt pile
whatever
but you know four or five six foot of of
trim and all kinds of other stuff he can
throw this up here and have ready access
to it
up here is another shelf we did add
another vertical divider that's not
shown here and then a shelf on top
on this side over here is basically a
wall of storage
there's i think there is 29
26 drawers completely there's what four
three that's seven that's 21
22 23 24 25 26 drawers
uh to his specific sizes now he was
under
we were making sure that as we dimension
this out now again this is just the wire
frame so that 10 and a half inch opening
is not going to be a 10 and a half inch
deep drawer because you have to consider
the drawer bottom and the drawer runners
and making it make sure everything lines
up all that good stuff so
we came up with this wireframe model
over here all the drawers
and the top is cubby dividers which has
a bunch of cuts
in a bunch of dadoes in here that
quarter inch plywood can be slid across
so this took five hours
or so to get to this stage on the first
day the next day which
wasn't a consecutive next day it was
actually a few days later
i turned all that into the final design
which is this and we can see around here
oh also i didn't mention uh this short
wall over here
accessed from the side door is the whole
wall of sustainers
or viewtainers i should say vutaners and
yeah that's just a basic shelving unit
nothing fancy there
so here's the the final design over here
all of these cutouts that i added
were simply to reduce weight these
cutouts in here were for him to fish his
hands through and find
some stuff but most of these other
cutouts were to reduce weight
this ended up being 25
full sheets of plywood something like
that most of it
half inch and it's all pine plywood
so how did i get here i'm going to walk
you through the process
of basically turning one of these wire
frames
into a cabinet and then we'll talk about
the cabinet itself
so if i quickly go to my next scene that
i already have set up and i'll hide all
this stuff because
my thinking is this is modular this is
one cabinet over here i'll hide
and then all three of these are
identical they're just screwed together
right one thing that i i did end up
doing
is my original plan was to make these
sides all the way up to the top this all
one solid side piece and have these
dividers
integrated but as far as manufacturing
on the cnc machine it made much more
sense
to make the cabinets just the drawers
and then have this top cubby section set
on top
so with my wire frame i'll hide these
others
and i can turn this wire frame into a
model quickly and easily i'm just going
to run through this
it's probably going to be too fast for a
lot of people but what i would do is i
would copy one over here and i'd right
click and say make
unique that way i don't screw this one
up because of this one all i want is the
wireframe
so i'll click and delete all of these
faces real fast
i don't want any faces i just want the
wire frame around it because that's
going to give me end points to stick to
now also
i don't need any of this top because
like i said that's going to be a second
section that i set
on top let's go to a top down view let's
see
top down view and i can delete all of
these lines and faces all at once
and there we go let's go back to this
view
so this is the wireframe that i can
build on
and like i said i'm just going to run
through it real fast all your dimensions
are here
for the perimeter so i can right click
i'm sorry
r for rectangle from this bottom right
corner to this top left p4 push pull and
pull this out by point
four seven inches this is
half inch plywood which is 23 30 seconds
and that is 0.46 and some change
something like that 0.47 inches works
great for mortise and tenon joinery on
the cnc machine so let's grab this
and let's triple click g for component
enter let's throw some color on it just
so i can
easily distinguish it from the
background q for rotate and now i'm
going to rotate this right into the
front
90 degrees what that does is it puts
that front face
in line with all of these lines so i can
use this
for setting up my mortise and tenon
joint so if i reference back
over to modules you'll see that
each one of these drawers i pull this
all the way out
has a runner and the drawer rides on
that runner the runner itself
is mortise and tenon into the side if i
drop the second color on there you can
see how that works
there's mortise and tenon joints from
these runners into the sides all the way
down
every one of these cabinets are just
like that so if i hide all of this hide
that side
you'll see that these taller cabinets
are like that
as well minus the bottom sections these
drawers were so large that we decided to
go with full extension drawer slides for
those
so lots and lots and lots of mortise and
tenon joints
so to do those
my lines are already here i can edit
this part t for tape measure let's come
in by 1.5 inches let's come in by 1.5
inches
r for rectangle and like i said we're
only doing these this top section so
let's go in this direction
and let's see the lower light lower
right hand corner shows my dimensions
the first one is the longer of the two
so let's go with
two comma 0.47 enter
that gives me this mortise right there
m4 move control brings up copy i'll copy
one over to here and then i'll press
divided by two to give me three
symmetrical mortises
on this panel i no longer need these
guidelines left and right those are
distracting i'll get rid of them i can
select the mortises
m for move control brings up copy and
i'll go from this end point
up to here and i know the spacing is
even so i can press
x3 to multiply what i just did by three
and there we go so now my mortises are
there but here's a here's a quick little
trip
tip for you i can p4 push pull and pull
this back
point four seven inches enter and get
rid of it and then double click to go
through all of those
sometimes that's a little time consuming
when you have say 30 or 40 of those to
do
so here's one thing that you can do you
can go to let's go with a top down
view so now i can select
just the thickness of my material
minus the front face this is outside the
wire frame so this is the front face
selecting the back and the sides and the
top and the bottom
delete it and some of you're thinking
that's kind of crazy why would you just
delete something that you just
uh you know made into a you know
component for the thickness
the reason being is it's much easier to
spacebar triple click to select
everything hold shift to double click to
deselect
what i just had over there and that
leaves me with just the area selected
delete that push pull and push this back
0.47 inches
so just a little work around to know
your selections
as far as push pulling and which is
faster which is which is easier
so now that i have one side done i can
rotate this back into place
m4 move control brings up copy they are
symmetrical
so they go right there so you can see
how this gets built pretty quickly
and from that same concept i can start
putting stuff inside one another so
uh r for rectangle let's just go from
here to here
and the first dimension is the longer
the two i'll leave that
and i'll change the second one only by
pressing comma four
enter so that's four inches wide p for
push pull i'll push this down
point four seven inches for the
thickness spacebar triple click
actually no not yet i still need to make
the joinery real quick
let's just say that
let's go to this side over here so i can
see it a little bit better without this
being in my way
i want to make a pair of
of box joints basically i don't know
what you'd really call this
uh so let's draw a rectangle right there
dimensions
say that the first one is the longer of
the two so i'll press
1.5 comma enter to modify that
now i want to center this perfectly so m
for move from this midpoint
and i'll press r for right uh r i'm
sorry
right for red to constrain to the red
and i'll drop it off at the midpoint
back here so now i know that's perfectly
centered now that it is selected
m4 move control brings up copy copy it
into the back
and what i can do is grab this push it
back by .47 inches
and go to this side and push this one
back
to that point 0.47 inches basically what
i'm doing is drawing box joints
onto the pieces space bar triple click g
for component
enter so that i can trace them on
everything else
now i can get this side piece r for
rectangle and i'll just draw these two
rectangles real fast
p push pull whoops other direction
and there we go so now i have a box
joint that will be cut out perfectly on
the cnc machine
i can hide this and you can see the
difference right there that's that's the
two
pieces of the box joint so this is the
this is the joinery for the entire build
box joints right here on edges and then
mortise and tenon joints
in the middle that's that's the joinery
for absolutely everything and that's the
process
so i'm gonna go ahead and delete all of
that so i don't get confused go back to
my modules
scene and that whole theme is as
continued
all the way along as you see there's a
front
and a back on top the back pieces have
two back pieces and then the bottom of
each cabinet has two bottom pieces
so individually this is kind of flimsy
there's not much
not much there to prevent racking
so i wouldn't trust this for like a
bedroom dresser
you bump into the side and the front
it's probably going to rack quite a bit
and
do it enough it's probably going to
break something but
when you consider all of these screwed
together
all of these screwed to the wall in the
back you'll have a
lot a lot of rigidity without having to
have a face frame and without having to
have a solid back panel
so let's talk about the drawers really
quick the different colors here
designate different size drawers this
red drawer is one that's going to be
doubled up
with full extension slides for
pretty darn heavy stuff this one's
basically going to be
super heavy stuff these purple ones
are into individual drawers for
uh heavier stuff but they need full
extension slides
and then all of these other drawers are
not that heavy of stuff so it's just
going to be
wood on wood which isn't that bad at all
so the way
i make all of these is uh the
the drawer runner i'll drop a different
color on it so you can see
the drawer runner itself has three
tenons that go into those mortises that
we that i showed you a second ago so if
i hide this
you'll see that the three tenons stick
out and after the cnc machine cuts it
uh oh after it's cut out they'd
literally just clip together a little
bit of glue a clamp
some brad nails you're done assembly is
incredibly fast
with this style of construction so for
the drawers what i do is i extend the
drawer front
down by the thickness of the plywood so
it stops
right here on the slides that way no
matter what even if there's
basically no matter what the front of
the drawers
are in line with the front of the cases
i did not add the circles for the drawer
poles because in sketchup it creates
um in sketchup it creates a bunch of
segments
for the circle rather than arcs so i
just put crosshairs here and then i add
the circles
in in my cam software vcarve
so the drawers themselves are pretty
pretty darn simple let's select
everything hold shift
to deselect this everything else is
selected h4 hide
and we can focus on one drawer it's the
exact
same concept as the case it's box joints
everywhere
the bottom is box joint jointed jointed
into the sides and then the back but the
bottom
is actually mortise and tenon into the
front now it's important
in my opinion to make sure that these
sides
have two fingers on this connection and
then the front
only has one finger on this connection
the reason being is you're going to have
this is going to be glued together but
we are going to have brad nails
being fired through this through the
joint in all directions
and if you think about this if you put
two brad nails here two brad nails here
that's
four brad nails perpendicular to the
travel direction
which is much greater than if we flip
this around and only put two in this
middle one
you only have two in this one in that
direction so the brad nails are going to
add
theoretically some strength as far as
this front panel being pulled off
that's the thinking anyway and then all
of the drawers
as i swat a fly in front of me sorry all
the drawers are
built the exact same way they're just
sized
slightly different now on on the the
drawer fronts on these larger drawers if
i select everything
minus this drawer uh this one the drawer
fronts
don't have mortises on them all four
sides are built the exact same way
and this is like big big kid
legos everything just clips together
it's
pretty darn satisfying watching all this
stuff
come together so that's how i did these
these drawers basically these cabinets
and then
these these cubbies go on top so i took
these
boards here and i just used the cnc
machine to cut all these dados
and then you just stack them with
horizontal or vertical dividers put a
back panel on it and the back panel
massively stiffens all of this up and
there you go
that's going to be much easier to set in
on top this other side was kind of very
specific there's no joinery on this side
there's
no cnc box joints there's there's no
no joinery of any kind it's all just
butt joints with pocket hole screws this
is all
this will all get bolted to the wall
and that's all that's necessary there's
no need to go crazy with
uh specific joinery on this side
so that's basically it for the design
uh we we took or i took i forget exactly
8 to 10 hours something like that
to turn the wireframe into all of this
but i also during that time
took it a step further and made a layout
so i broke down
every single part onto the sheets
and i know you can import all this stuff
into v-carve
and have it nest it for you but
you lose you lose a little bit of
of specifics i want to be able to have
full control over this
so it didn't take me much time and
effort at all to lay all this stuff out
flat
in the orientation that i wanted it to
be laid out and then
also something to consider if with a job
like this
i'm going to be running the cnc machine
cutting all of this stuff out i'm not
really going to be assembling much at
all
so the other people need to be working
while the cnc machine is cutting so if
the cnc machine
scatters all i'm sorry if vcarve the the
nesting software scatters
all the parts on all the different
machines of the sheets
to maximize efficiency which is great
most of the time it may also
scatter the parts to where it slows down
the assembly
because you don't have all the
components to complete your specific
subassembly if that makes sense so i
laid all this stuff out this is all the
all of the sheets this one actually went
yellow we ended up going half inch on
this one so
all of these sections right here plus
this one are half inch plywood
this green one over here is quarter inch
plywood
and all of these are three quarter inch
plywood
and from there i deleted all the 3d
geometry for 2d geometry
and imported all this on a layer and
v-carve so that's just
kind of the way that i did it to get the
most amount of control
and then of course in vcarve you have to
go through and add dog bones to all this
stuff
i wish there is a gadget for that but
anyway i thought that would be an
interesting
video to walk you through how i go from
wireframe
to actual uh sketchup design
and also the reason behind it like i
said there's no need
for him to the contractor to sit there
with his notes and watch me
spend a little bit more time getting all
this stuff done
when we can simply focus on the basics
the wireframe model everything that i do
in sketchup
starts with a wireframe model if i'm
building a dining table
i've already got a pre-predetermined
notion of
of the overall size that i want to have
this table to be
and i'll create a 3d wireframe
that i can work inside of so i know that
i'm always constrained
to those particular dimensions
that's it for this video hopefully it
helped if you are interested in
uh purchasing the the vcarve file
for all the cnc stuff for this as well
as
this sketchup model i'll have all this
for sale on my website you guys take
care have a great day
and i'll talk to you in the next video
