Car Hauler Trailers — Bring On The New Trailer Plans

It’s a new trailer plans category at Mechanical Elements with plans for true, tough, Car Hauler trailers.  After a ton of market and product study, we are stepping in and stepping up.  Our niche is engineering better plans for DIY, so read on to learn about the new Car Hauler Trailers, and how we think in design.

This is bringing the tradition of Mechanical Elements into yet another trailer plans category — for hauling cars, and transporting equipment.

What Makes Our Trailer Plans Different?

Good question.  First, our plans have Full Engineering.  We are not just a weld shop with AutoCAD.  Nor are we a trailer parts store looking to sell parts.  We are first, an Engineering Company with a ton of experience in product design and development.  Because Engineering is our primary business, project plans from Mechanical Elements are top of the line.

Plans For Car Hauler TrailersSecond, the plans come from an engineer that loves building in the shop too.  I have designed literally hundreds of products from toys to medical tech, from simple tools to precision robotics.  Aerospace, and mining.  Fine tuned parts and hard-core components.  Factory automation machines, and new intellectual property.  Most important, I build much of what I design, so I’m not the nerd in a cubical wondering about designs that leave my desk.  Our plans include bits of all I’ve learned in both engineering technology and in building what I design.  If you have interest, then check out the Big Slide Show.

Third, we offer more.  Our plans are more complete with more options, better instructions, and more information.  Of course, plans include a Bill of Materials, cut list, components list, and variations for all it.  But, it’s not just the plans and documentation.  The end product is stronger, more capable, and offers greater function.  The goal is to give you the best in DIY Trailer Plans.

Enter the Car Hauler Trailers

For a long time I’ve looked at various car hauler trailers to see what’s around.  There are good ideas everywhere, then there are head slappers too.  For many reasons, recently I’ve been keen on Car Hauler / Equipment Transport trailers.  So, I’ve modeled some existing trailers and found many won’t do what they say — at least not to the level of safety I am willing to pull with a full load.

Can I do better?  Oh yeah.  No question in my mind, but I’ll let you decide.  Read below to understand our master plan for car hauler trailers.

So, there’s the motivation.  Now, the execution.

The Specification:

When starting a new project, we like to know where we’re going.  So, we create a thought map, or specification.  What is on your list for a dream Car Hauler Trailer?

First, the overall style.  Because of the length, tandem axle suspension seems most appropriate.  Beyond that, there seems to be 2 camps, each with 2 camps for Car Hauler Trailers.

Which Style Do You Want? Deck Style
Solid, Fixed Deck Platform Tilt Deck
Traditional Fenders
(fixed, pivot, or removable)
Drive-Over Fenders
(wide, higher clearance vehicles)

From my point of view, these all have advantages, and purposes, so there is no reason to say one is better.  Well, that means we will eventually need to develop several different trailers.

What are the Implications?

1.  A typical car hauler deck is wide enough for most vehicles to fit between the trailer wheels.  That means most decks don’t need to extend wider than the main frame beams.  However, with low vehicles, fixed fenders can cause door opening issues.  So, that’s why removable fenders are popular.

2. For wide vehicles, driving over the fenders offers simplicity.  You just drive on, and over the fenders, which is great for higher clearance vehicles.  While that is fun to consider, it really means if the vehicle are wide enough to hit both fenders, they probably need more deck.  So, for Drive-Over fenders, the fore and aft deck should be wider than just the area between the main rails.

3. Interestingly, all the above apply to both Fixed Deck trailers and to the Tilt Top Decks.

4. Ramps are frequently part of the Fixed Deck system for loading.  On the other hand, with Tilt Deck trailers ramps are usually not needed.

5. Structure required for Tilt Decks is quite a bit more involved than for a Fixed Deck.  That means a Fixed Deck trailer can weigh less for the same capacity.

Trailer Size

Next are the questions of both size and capacity.  Let’s start with size.

Most car hauler trailers are max width, meaning deck width between the wheels is around 82″.  When you add wheels and tires, the trailer width is 8.5′, which is the max allowed for most places without a permit.  And, it works for most vehicles.  See above about drive-over fenders.

Length is a different story.  Car hauler trailers range from about 12′ long to about 24’+.  Some equipment transport trailers are longer, but very few vehicles exceed a length that won’t fit a 24′ trailer.  Well, we’ll side-step the multi-car trailers for the moment.

What is the right length?  16′ is the most common, but the 18′ market seems to be growing fastest at the moment.  20′ is also very common.  So, for our trailer plans, we’ll start with 20′ (giving an option for 19′ or 18′), then move from there depending on customer feedback.

Load Capacity

A 7000 lb capacity trailer will carry most cars.  Not so good for trucks or larger SUV’s, and usually inadequate for a lot of equipment.  7000 lbs is quite popular.

The next capacity step is 10,400 lbs.  That makes the trailer a little heavier, but it is sufficient for most cars, trucks and SUV’s.

We can say the same for 12,000 lb capacity car hauler trailers.  While 12,000 lb trailers are not as common, it is a great capacity for many needs, and especially for equipment transport.

Then, we jump to 14,000 lb and 16,000 lb trailers.  Very few passenger vehicles need this capacity, so these big boys are better suited for equipment transport.  The trailers are heavier, and sometimes longer.

So, what capacity should we choose?  Let’s start in the middle.  Our first car hauler trailer will be a practical 10,400 lb capacity.  We’ll listen to your input for where we go next.  Let us know.


A low profile makes sense for most car hauler trailers.  That means lower profile beams.  Most 10K car haulers have 5″ C-Channel to get a low-ish profile, but that is not quite strong enough for our standards in this capacity.

For this first trailer, we want the same 5″ tall beams for a low deck height, but . . . How do we balance height with strength?  We choose a mixed approach with I-Beam constructionI-Beams offer an excellent strength to height to weight ratio, so the trailer is very robust.

To help understand the need for robustness, here is an animation of the I-Beam frame in 3 conditions.  With an evenly distributed load, then yes, the I-Beam design is a little much.  However, with a long vehicle on it, like the F-150 of our previous post, we see it’s a good thing.

Changes with Loading

A really interesting point is the load position.  Moving the truck forward 18″ changes the stress quite a bit.  Since very few people place a car (or truck or equipment) based on actual tongue weight, to me, that means the trailer must handle a bunch of non-optimum positions.  So, we’ll make it strong and the trailer will do what YOU say, not what some engineer at the factory HOPES you do.

So those are the primary thoughts in starting a new project for Car Hauler Trailers.  Next, there are a ton of possible options, so let’s look at those.

Options For Car Hauler Trailers

Since there are a bunch, I won’t dwell long on any one.

  1. Axles.  Choose axles to share the load.  Options include Straight or Drop, Spring types (eye-eye, or slippers), Overslung or Underslung springs, Brake types, Hub styles, Bolt Patterns, Camber or not.  Capacity is defined by the load rating of the trailer.
  2. Car Hauler Deck OptionsDecking style and material.  Plank Deck, Full or Split.  Plywood or Metal.  We make them all as options.
  3. Ramps we mention above, but where do they store?  Some store in the center of the deck.  Some store by sliding-in under the deck.  Still others have a rack on the side.  No need to limit it, choose what you want.
  4. Tie-Down Anchor Points are important for Car Hauler Trailers.  In my opinion, we need many, so our plans have tie-points covered.
  5. Dovetail.  Some people like them, some people don’t.  So we give it a nod in the plans, but the prime design is a flat deck.
  6. A Front Rail is a great option.
  7. Many component choices and options are available.
    1. Hitch styles – we choose the adjustable channel style.
    2. Jacks – Plans show some common options and give structure to mount them — for the tongue, and for rear loading.
    3.  Toolbox – Choose one or not.
    4. Winch – Your choice.  We think it’s good for car hauler trailers, so we give choices.  Add one permanent, or removable (so it’s not in the weather and not a theft temptation).  Both options are in the plans.
  8. And, we include the electrical wiring diagram with options.

Car Trailer & Equipment Transport Plans

All the above are the essence of what our new car hauler / equipment transport trailers are about.  Of course, there is a lot more in the details.  If you like our thinking, let us know.  If you think we’ve fallen off our rockers, let us know that too.

For now, we have the first of our Car trailers in the plans store.  Box A in the table above.  A 20′ 10K Fixed Deck, with removable fenders, and the slightly higher capacity 18.5′ 12K Fixed Deck of a similar design.  Both have many options for you to customize.  We’ll add more car hauler trailers with time.

In the meantime, please have a look and let us know what you think.  Also, please tell us what you’re looking for in car hauler trailers — or for equipment transport trailers?  Let us know, and we’ll consider it in our future plans.

Have a wonderful day, and thank you for reading.


Inline Feedbacks
View All Comments

We Found These For You . . .

How Much Can I Tow?
There are 3 main factors with how much you can tow.  While it all seems simple, digging in makes it a little less clear.  Yes, it’s easy to look at the simple rating numbers, 

Read The Article

Which Welder To Buy?
I’m looking to build one of your trailers, but I need to know which welder to buy?  What type, and do I need 110 or 220 volt?  What about other projects from your site that may pique my interest?

Read The Article

Trailer Suspension Equalizer Link
There are many different sizes and shapes of the suspension equalizer link.  What are they for?  Better yet, when should I choose one shape over another? If you’ve read much on this website, then you know

Read The Article

How We Make The Plans
What goes into the engineering of Do It Yourself Plans?  How do we make them?  When you purchase and download project plans from Mechanical Elements, you get a TON of work and information, much more than first meets the eye.

Read The Article

10x32 Wide Tiny House Trailer Plans

To meet the needs of a wider Tiny House, these 10’ width trailer blueprints include extra engineering and design.  Low, wide 10’ x 30’ or 32’ top deck.  Up to 18,000 lbs total capacity.

The Car Parking Stop Solution!
Yeah, I know, most of the world doesn’t like or use the parking brake any more.  Yet, some of us still prefer a manual transmission for the driving experience — and rely on the parking brake.  So, what happens

Read The Article

Welding Pre-Stressed Steel Fabrication
The concepts of pre-stressed steel fabrication have been around for ages, but they are not often applied for simple welded structures like trailer frames or crane stands.

Read The Article

Review of the Folding Trailer Tongue
On a recent trailer, I experimented with a new folding tongue design.  Now it’s time to review — What do I like?  What would I do different if building another?

Read The Article

How To Make A Trailer Longer
Sometimes I wish my trailer was longer.  Is there an easy way to make a trailer longer?  Is that even possible?  And, what are the limits

Read The Article

Drive Over Fenders Trailer Plans

With a Heavy Duty I-Beam design and a Low Fixed Deck, these Car Hauler Trailer Plans include Drive-Over Fenders for wide stance vehicles.  12,000 lbs (or 10,400 lbs), 18.5' long, 8.5' wide, and many Options.