6’10” x 12′ x 3500# – Utility Trailer Plans

6’10” x 12′ x 3500# – Utility Trailer Plans

Make your new trailer full width starting with a 6′ 10″ width deck.  These blueprints are 12′ length and 3500# capacity for a very functional utility trailer.  Choose from the many options to build it like you want it.

Free Digital Delivery — Right Now*

$ 18.99 - Complete Plans

* Plans are in a computer document. You may Save them to your computer immediately after Payment.



The 6′ 10″ width (frame between the wheels) is basically the widest you can tow without permits.  This trailer maximizes the space available at full width.  Then, the 12′ length is great for getting the jobs done.  It’s a great trailer for business, landscaping projects, carrying toys (like ATV’s, UTV’s, Side-by-Side’s, etc..), . . . you name it.  Lots of deck surface area to work with.

Build the trailer you want in the size that makes most sense to you.  Most of all, build it to last!  You can be confident with plans from Mechanical Elements.  Like all our plans, these include the full array of engineering.  We won’t sell anything less.

Also, like all our trailers plans, these include a lot of options so you can make the trailer perfect.  Choose the ones you like – sides (of various styles), ramps, tailgate, or other options.  There are component options too.  And, a lot of functional extras like deck materials to choose, and various tie-down options.  It’s your trailer, so we provide the fully engineered base, and give ideas, then you build the trailer you need.

These plans for a 6′ 10″ width x 12′ length, single axle, utility trailer are 3500 lbs capacity.  The base design is for leaf springs, yet, if you prefer, we also have a Torsion Axle Conversion for it.  See below.

Add To Cart

We have alternate sizes — like a 6×12 — if that works better.

Open “Alternate Sizes & Conversions” below to make this a Tilt Top Trailer.
For a Torsion Axle, we have a conversion for that too.



6’10” x 12′ x 3500# – Utility Trailer Plans

Engineered Heavy Duty Trailer Design
Full Engineering Analysis is complete for All Trailers at Mechanical Elements.  This is just one example of the engineering analysis that goes into the design.
  • Single axle, leaf spring design.  (Torsion axle conversion available.)
  • 6′ 10″ width x 12′ length nominal bed size.
  • 3500 lb. trailer axle rating.
  • Welded steel frame construction for strength and robustness.
  • Plans are fully engineered so you can build with confidence.
  • Option for rear Tailgate that folds to a Ramp.  See the above images.
  • Several options and ideas for the deck and for trailer sides (completely optional).
  • Removable ramp that stores under the trailer, then lots of optional tie-down points.
  • Includes bonus plans for making a motorcycle travel stand.
  • Plans include complete drawings along with illustrated instructions.

Add To Cart

More About The Design Features

More About The Design Features

This trailer is very similar to our 6′ x 12′ trailer, except it is the full legal width at 102″ wide when you include the wheels and tires.  That extra width can come in very handy for the right situations.

Like all our trailers, this one includes full engineering for the many details that are not immediately evident.  Here are some of those details.  This is a Synthesis design made for maximum usability because we want your trailer to be a success for a long time into the future.

Plans include a lot of options.  See all the images.  There are various options, so choose the ones you like, and disregard the rest.  The images below show options for the tailgate or ramp system.  It’s all up to you.
Tailgate Options with the 6x12 Utility Trailer

6’10” x 12′ Utility Trailer Plans Details

  • Bed size is a full 6′ 10″ wide, by 12′ 3.5″ long.
  • Bed height ranges from 16″ up, depending on options you choose.  (Bed height shown is ~19″ with a drop axle.)
  • Axle capacity is 3500 lbs.*  This is the total load capacity which includes the weight of trailer and options.
  • Typical dry weight is 840+ lbs for the simple flatbed version.  However, adding options like sides or tailgate or toolbox will make it heavier.
  • There are many options in the plans for various functions.  Some options are mutually exclusive, but not all options are in these pictures.  See the animated image for some of the ideas.
  • These 6×12 utility trailer plans also include customization ideas for special uses – from ATV & motorcycles, to trash or furniture or landscape needs.
  • All the options are customizable.  We think you should make the trailer perfect for you.

Some Options Available on The 6x12

Add To Cart

Alternate Sizes & Conversions

Alternate Sizes & Conversions

Not Quite The Perfect Trailer?  Check These Too.

More trailer sizes and variations are available.  See All Trailer Plans.

Want This Trailer With A Torsion Axle?

Torsion ConversionA Torsion Axle provides some nice benefits for some applications.  If you want this trailer, but with a Torsion, we have Plans for the Conversion.  They show the changes to properly strengthen the frame for mounting the Torsion Axle.

Conversion plans are sold separate.  You will need both the above Trailer Plans and these Torsion Axle Conversion Plans.

$ 4.99 - Complete Plans Add To Cart

Make It A Tilt Top?

Tilt ConversionIf you want this trailer as a Tilt Top, we have Plans for the Conversion.  They show how to make this trailer with a tilting top, like in the image.

Conversion plans are sold separate.  You will need both the above Trailer Plans and these Tilt Top Conversion Plans.

$ 9.99 - Complete Plans Add To Cart

Maximize Your Project

Plans from Mechanical Elements are an awesome start to a great project.  Here are even more resources!


Maximize Your Project

Reviews (0)


There are no reviews yet.

Be the first to review “6’10” x 12′ x 3500# – Utility Trailer Plans”

Good planning is the beginning of a successful project.
Great Plans Are Available Here!

We Found These For You . . .

Trailer 5 x 8 - 3500 lbs Torsion Axle

Designed specifically for a Torsion Axle, these 5' x 8' utility trailer plans include a 3500# capacity and many options to choose for making the trailer meet your needs.  And, fully Engineered Blueprints, of course.

24' Tiny Home Trailer

Build on a solid foundation starting with plans specifically designed for the unique needs of a Tiny House Trailer. Low 8.5’ x 24’ top deck. Up to 14,000 lbs total capacity. Fully Engineered.

I-Beam Clamp Introduction
Introducing a new product to the Mechanical Elements family of Do-It-Yourself Plans — the gantry crane I-Beam clamp.  A simple product we give as Free Plans in our launch celebration!  Well, is it really FREE Plans?  Yes.  Use the coupon…

Read The Article

Plus and Minus of Low Trailer Deck Height
To some people a low trailer deck height really matters, to others not so much.  Yet you read about it in trailer descriptions a lot.  So, what are the trade-offs for a low deck?  And how do you achieve it? …

Read The Article

Is there escape from covid-19?
What more can we say about Coronavirus?  The daily press updates are full of horrible news!  There’s so much concern and sadness everywhere.  Then there’s the “Stay at Home” mandates.  I need an emotional escape from COVID !!

Read The Article

Cost and DIY Project Economics
“I want to build a new trailer.”  That’s an awesome thing to say, and it’s even better to do.  Yet, many such adventures don’t launch because of project economics?  What does it cost to build? 

Read The Article

8.5' x 16' 7000 lbs Deck Over Trailer Plans

With a full flat deck, these plans show how to build a workhorse of a deck-over trailer.  Options are plentiful, including ramp sizes, deck types, sides options, rub rails, front rise rail and more.

Mechanical Elements 4x8 Utility Trailer Plans

A small-ish, yet really tough little trailer.  Get these single axle 4x8 Utility Trailer Plans to get the jobs done.  With a total capacity of 3500 lbs., trailers built from these plans will work hard.

Car Hauler Trailer Plans

24' Heavy Duty Equipment Trailer with option to build for 14,000 lbs capacity, or for 16,000 lbs.  Tandem Axles, I-Beam Design for strength, Fixed Deck, Full Engineering, and many options.

Aluminum Trailer Frame Underside
Aluminum is such a great material.  It’s light, strong, and looks sweet to boot.  So, why is there a debate about Aluminum Trailer Frames comparing to others like steel?  Or comparing for beams like with gantry cranes?

Read The Article