The DIY Kayak Trailer That Saves Your Back and Your Budget

Build a custom trailer for $400 and never hoist a kayak over your head again.

I've strained my back loading and unloading kayaks from our stylish minivan more times than I care to remember. It’s an exhausting process of hoisting, balancing and sliding them on, one by one. Then balancing on a tire to get straps in place and secure. It’s the worst part of kayaking. I end up tired, sore and in a bad mood before we even leave the driveway.  Worse yet, I have dented and scratched the Town and Country more than once.  There are better options and you don't have to spend $1500 or more on a custom kayak trailer or expensive roof rack.  For under $400 you can build a DIY kayak trailer that will save your back and a heap of money, this article will show you how.

diy kayak trailer

What Are Your Options?

There's expensive roof racks and then there's expensive trailers.

Unless you have $1000 or more to spend your options are limited.  I looked at every kayak rack and trailer on the market and none of them can hold more than two kayaks and the starting price is very high.  

The only roof rack offering a solution to the pain of loading and unloading kayaks is the Thule Hullavator. It's a set of two kayak holders that lower over the side of your car making loading and unloading very easy, but they cost $600 per kayak.. and that doesn't include the base rack to attach them to.  You can fit two sets on a vehicle to carry two kayaks and the total will end up being around $1500!  

DIY kayak trailer

The other option is a kayak specific trailer.  Malone makes the most popular, but the base trailer lists for $1299!  You can find it for as low as $899, which doesn't include accessories.  Fully rigged they run over $1500 and only hold 2 kayaks.  Not working for me.

DIY kayak trailer

A quick Google search for 'DIY Kayak Trailer' will serve up some interesting rigs, many built on the Harbor Freight 4' x 8' Heavy Duty Foldable Trailer. You can pick one up at your local Harbor Freight store for $299, or buy it on their website and pay to have it shipped. Use the shipping estimator on their site to see what the cost will be (it was about $100 to have one shipped to my zip code in upstate NY).  

It's a solid steel platform that's easily customized to fit your needs with some lumber and PVC or aluminum pipe. You 

DIY Kayak Trailer

Attach as many kayak carriers as you need and your DIY kayak trailer will be a hauling machine.  You can get a set of 4 kayak carriers from the best sellers on Ebay for under $45 with free shipping.  They are powder coated steel will solid hardware.  I have used the same set for the past 3 years and they are rust free and as strong as the day I got them.  Compare that price to the big brand names that cost 4 or 5 times more! 

diy kayak trailer

  The rest of this article describes my out of the box trailer build and customized rack that holds five kayaks.

DIY Kayak Trailer Build: Assembling the Harbor Freight Trailer

Out of the box it's a heap of metal, a box full of hundreds of nuts and bolts, and some decent (not great) directions.  The components are solid steel and the hardware is beefy. Assembling the trailer is actually quite simple for anyone a little handy and can be built in an afternoon with the help of a friend and the right tools.

diy kayak trailer

Before getting started I highly recommend buying two wrenches that will make your build ten times faster and easier!  There are over 75 sets of the bolt / lock nut combination pictured below.  Some of the spots are tough to reach and frustrating to tighten with a normal socket or crescent wrench. 

bolts and nuts for the trailer build

You can pick up a 16 mm and 17 mm Combination Wrench for around $12 to $15 a piece.  With a ratchet on one end and a fixed wrench on the other they reach into tight spaces and get the job done. They are the correct size and I would never try building this trailer without them, they were worth their weight in gold.

diy kayak trailer

In the first few steps you'll assemble the two decks and the tongue of the trailer. It's made of steel so it gets heavy as it’s assembled. If you don’t want to scrape it up as you move it around have some help, or put something under it like a carpet remnant.

diy kayak trailer

The decks are then attached with a hinge on each side and the trailer is folded over.  Make sure you have adequate headroom to flip it over as it is large.

diy kayak trailer

The part of the project I was most concerned about, the suspension and axles, turned out to be the simplest.  They attach with only a few pieces of hardware and tighten down easily. 

diy kayak trailer

The final steps... put the wheels on, flip it over and lock the two decks of the bed.  You have a trailer!  

diy kayak trailer

In the image above you can see the vertical set of casters, just behind the wheels, that are used when you fold the trailer to save space. Since I didn't plan to do that I removed them.  This also clears space you'll need for kayak storage.   

Now comes the fun part! The trailer is complete it's time to start customizing.  


DIY Kayak Trailer Build: Customize the Trailer for Your Needs

The Harbor Freight trailer is made to be customized. Holes along the top and sides of the frame allow you to bolt all kind of material needed for kayaks, in any configuration you can think of.  

This particular build can be broken down into three parts:

  • Attaching the Deck
  • Building the Lower Rack
  • Building the Upper Racks

Attaching the Deck

Laying a solid deck on top of the trailer will protect your kayaks from anything that the road might kick up. Half inch plywood is inexpensive and works well.  I was able to get a piece of thin, industrial plastic for my build which won't rot or rust.  

deck on the diy kayak trailer

But before you attach the deck, it's a good idea to install some hardware for kayak straps while you have easy access to both sides of the frame.   Simple eye bolts and lock nuts are easy to install in the existing holes on the back and sides of the frame.  

eyebolts for straps on the diy kayak trailer

At each corner of the trailer is a large hex bolt that sticks up.  It's a good idea to make a diagonal cut in your decking to expose this and allow your deck to lay flat and flush to the frame.  Next, clamp the deck to the frame and start drilling mounting holes for the next step, which is attaching 8 foot beams on the trailer. 

diy kayak trailer deck cutaway

The frame has three sets of holes on the front and back that can be used to bolt eight foot 2x4's that will serve as the main beams the rest of the structure will attach to.  2 1/2 inch, 5/16 hex bolts secured with lock nuts underneath worked perfectly.  

three main beams on the diy kayak trailer

From this point there are lots of ways to build a kayak rack on top of the deck. I need the trailer to hold five kayaks so I plan on building a lower deck that holds two, and an upper deck holding three more.

Building the Lower Rack

This is a relatively simple step that involves laying two, 6 foot 2x4's  across the beams and attaching them with L brackets and screws.  These are your crossbars, which will be much stronger if you set them on the short edge.  This will also allow you to attach a pool noodle or pipe insulator over them to protect your kayak.  

cross beams on the diy kayak trailer 2

Using a total of 3 brackets per crossbar will give you one per beam and create a rock solid rack. 

cross beams on the diy kayak trailer 3

Another view of the finished lower crossbar. Drill small holes through the crossbar and use zip strips to hold the foam in place. 

cross beams on the diy kayak trailer

If you only have two kayaks to haul your DIY kayak trailer is finished.  Load them up and go for a paddle.  But if you have more than two, read on as we will add the upper racks to hold 3 more kayaks. 

bottom deck of the diy kayak trailer finished 2

Building the Upper Racks

The upper racks will be held up by the structure you will build on the center beam so it's a good idea to put your kayaks on the lower rack to see how much room you have.  The two kayaks pictured are around 30 inches wide leaving plenty of space in the center and on the sides.

bottom deck of the diy kayak trailer finished

Measure a 2x4 to the height you need, in this case it's 28 inches, and using an L-bracket attach it to the center of the lower beam and crossbar.

upright image diy kayak trailer

Attach an identical post to the front beam and crossbar, followed by another 2x4 connecting the two at the top.  This creates a very strong center structure to attach the upper racks to. 

The next step is to attach the upper rack crossbars.  For this trailer I chose two, 1.25 inch PVC pipes cut to six foot lengths.  You could use 2x4's, but you won't be able to attach the steel kayak carriers mentioned earlier.  This size PVC is stiff and the perfect size for the kayak carriers.  

Drill two holes in the center of the top of the tube. The need to be large enough for the heads of the self tapping fasteners to fit through.

mounting the pvc upper tube on the diy kayak trailer

Screw the fasteners through the bottom of the tubes and tight to the posts.

mounting the pvc upper tube on the diy kayak trailer 2

Your PVC crossbars should be at a 90 degree angle to the center structure of the upper rack.

diy kayak trailer top tubes installed

The last step in building the upper racks of your DIY kayak trailer is attaching the outer supports.  You will need to measure and cut. four 2x4's to a height equal to the center posts so the top cross bar is level.  Sit the support on top of the lower rack cross bar and attach with an L bracket like the one pictured, on both sides of the support, to create a super strong rack. 

Lastly, attach your PVC cross bar to the top of the support.  You can do this a few ways but the simplest is to drill a 45 degree pilot hole through the end of the PVC and attach it will a self tapping fastener.  

You now have a top rack to attach your steel kayak carriers to.  For my needs I lay a single kayak in the middle and attached two carriers giving me space for 5 kayaks.  The hardware included with the carriers is perfect for a round tube and doesn't move once it's tightened down. 

The rack is six feet wide and easily fits in a garage.  You could substitute an aluminum pipe on the top rack and attach two more kayak carriers to hold six kayaks if you need to.  Or, if you only have two kayaks just use the lower deck for super easing loading and unloading.  

rear view of finished kayak trailer

There's lots of options for customizing and all you need is some lumber, hardware and pipes from Home Depot and some J style kayak carriers.  I have had this same set of kayak carriers for three years and they've never let me down.  As I mentioned before I purchased them on Ebay from a great seller in California and paid under $45 with free shipping.  You can't beat that.  Plus they are made of powder coated steel with durable hardware.  If you would like to check them out here is the link... 

2 Pair Universal J Bar Kayak Carriers

diy kayak trailer

Wrapping It Up

If you are sick and tired of loading and unloading kayaks from the top of you car or SUV there is a better option.  A DIY kayak trailer like this one is inexpensive, easy to build and easy to tow.  Once you start using one you will never go back to car top carriers, especially if you have a big heavy kayak.

diy kayak trailer main image

The best part of the project is the cost.  I spent a total of $424.49 to build this trailer and racks!  Compare that to the cost of 'kayak specific trailers' and the Thule Hullavators that cost $1500 and hold two kayaks!

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