How to Turn a Harbor Freight Trailer Into a Kayak/Camping Trailer

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Introduction: How to Turn a Harbor Freight Trailer Into a Kayak/Camping Trailer

This is my first instructable but I have posted this on some kayak forums with positive feedback so I wanted to post it here and enter it into the outdoors competition. I wanted a trailer I could haul our three kayaks on and our camping gear but all the trailers I found for purchase were $1000 plus. Here is how I built mine for $363
I started with the harbor freight Kit and turned in into exactly what I needed.

Step 1:


 I started with harbor freight #42708 - 870 Lb. Capacity Utility Trailer, 40" x 49". It was $219.99 and with a coupon I got it shipped to my door for around $160. In addition to the trailer kit here is what I used for this project –

10’ 11ga 2” square tube

14’ 1/8” 2” angle iron

2 6’ pieces of 1.25”od round tube

4x8 sheet of 1/2” treated plywood

2 12’ 5/4” deck boards

2 8’ 5/4” beck boards

4 10’ 2x4s for bunks

7 eye bolts for tie downs

6’ wire for harness extension

Front braces are 3/4” steel bar that was already bent that I got from a scrap pile

For those who don’t know the above picture is what the manufacture intended it to look like.
 

Step 2: Start the Build

Day 1

First I started by assembling the kit to have a starting point, make sure you square the basic frame and check several times while you tighten since the entire build is based off this. After you are happy with this point throw away the instructions because now the fun begins!

 

I wanted to add a brace to connect the tongue directly to the spring hangers so I added this. It is a piece of the 2” angel iron lined up with the front spring holes. I turned the frame around so the axle centerline would be farther forward since I will be extending the front. This will make weight distribution better and be easier to pull and track better.


Step 3:

Now grind off all the powder coat on the joints then some welding. I wanted a longer bed to haul all my camping gear and coolers so added some extensions. These are 2’L each and are made from the angle iron. This will make the bed 6' long. Tacked everything in place ready to square, used the original tongue for the front brace since I won’t be using it for its intended purpose. I then Burned everything in and hit the welds with primer, I welded all connections together including the spring hangers to the brace I added and the rear hangers to the frame.

 

Step 4:

Tongue bolted with grade 8 bolts and welded on, if it is worth doing it is worth overdoing. Started welding all metal to metal connections but I ran out of welding wire so this is a good stopping point and hit with a light coat of primer to protect from rust until I can finish

Step 5:

Day 3 started with a trip to tractor supply to get some welding wire then I figured I would do a little cosmetic work filling all the holes I'm not going to use. This is optional but I wanted it to look good

Step 6:

Now it's time to put the front upright on using some scrap I had laying around, Bolted on with grade 8 and then welded. Also added a sleeve over the tongue to beef up where all the weight will be (this is optional but it was scrap I had so might as well use)

Step 7:

Back uprights and bar welded on, Finished the day with a little wire brushing of welds and shot primer on the entire trailer. Tomorrow is family stuff so won't be able to work on it again till Tuesday, then I'll add the front supports for the sideboards and start wire brushing and sanding for paint.

Step 8:

Okay, let’s get this thing finished

More grinding, sanding and priming and welded on front uprights. Let the primer cure for a few hours and time to start paint.

Step 9:

Bottom primed and painted, I hit this with oil based black for the best protection. Shot this paint everywhere that won’t be color (places you don’t see)

Step 10:

Now to work on the top side, shot everything that will be blue with a base coat of metallic silver to really make the blue bright

Step 11:

I put 3 coats of blue on and 2 of clear.

Step 12:

Coupler on with grade 8 bolts, added front eye bolt tie down and starting wiring

Step 13:

Now time for the floor

Step 14:

Got carried away and didn't take any of side rail and axle installation but it is pretty straight forward (might have to refer to instructions for axle setup)  here is the kids enjoying the "almost" finished product, we run up and down the road several times to seat the bearings.

Step 15:

Total price is $363. And it weighs right less than 350lbs

Here is the finished product all loaded up, I have three kayaks on here (my daughters 6’ sits in the bed) a grill, firewood, tent and other camping stuff loaded.
 

 

I am very happy with how this project turned out. I pull it with my 4cyl escape and have had it to 70mph+ on the interstate with no problems. Since it is so light weight I can hardly feel it behind the car, and I have less invested than most put into converting a jetski trailer and everything is new. The only thing I might change is making the bunks moveable so I can put 3 full size yaks on top.

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    23 Comments

    Nice trailer

    how fast can you go on the highway and is it easy to control

    user

    Hi!

    Does anyone could tell me the width between both wheels? I am trying to see if I can put under the deck of my home but not sure if it can go through between two poles. Also, the deck is only about 4 feet high.

    Thanks

    Young

    Looks good! I was hoping I wouldn't need a welder for this, as I am in the market for a 17t and needed to build a Harbor Freight to do the trick.

    I am new to kayaking and just bought a hobie outback. I thought I could haul it in my pickup bed but I am not strong enough to lift the boat up into the bed. I talked to fabricators to come up with something that would help me, we thought of pulleys, winches, ramps with wheels and it is just getting too complicated and expensive. Today I got turned on to this HF trailer. Can you tell me what the distance from ground to the frame to put my kayak on is? Do you suggest I put a plywood deck (covered in marine carpet) on the trailer to haul the kayak or can it be hauled as is? Since I am a newbie to kayaking, not at all mechanical (but I have male friends that will assemble and help me with this project) please give me any suggestions, knowledge, problems what have you so I can get on the lakes before summer ends. Do I need some kind of pad eye or hook to tie down the kayak or does the trailer come with these? I am desperate to get out on the water instead of looking at my beautiful boat sitting in my barn. sigh. Help! thank you so much!

    baja betty

    baja betty, For my trailer the load height is about 38" but that is because I wanted to make the bed underneath to hold my tent, firewood and other camping gear. I usually pick up the nose of the kayak and put it between the bunks then grab the rear of the kayak, lift and push forward and the kayak will center itself on the bunks and you only have to lift one side at a time. You could get one made that would be as low as 16" or lower if needed. To hold the kayaks I used 2x4's for "bunks" or rails to pull my kayaks up on and you can go to any marine shop to get bunk carpet to cover them. You don't need an entire floor just to hold the boat. For tie downs, I used eye bolts so I could fasten my ratchet straps securely to the trailer. I had to buy these separate at a local hardware store. If you have any other questions feel free to shoot me a PM and I'll try to help out! Happy kayaking!

    Thank you so much for the reply. After being totally frustrated with this project because I cannot do it myself and depending on others has been not so good, I went ahead and bought a Malone Micro sport seawing kayak trailer. Sigh, a lot of money but I wanted to get my new kayak out on the water before I croak. You are a godsend however for others that can DIY things, unfortunately I can't. I so appreciated you posting what can be done and I hope others will have as much success as you have. Great too that after so long you still are willing to help. I wish you were my neighbor! I'd be putting you to work.

    thanks again!
    baja betty

    Andy, linking to your site is great, I like that other people can get inspired by my ideas!

    Hi Frkzila,

    Great post. I even see your design being applicable to the other types of trailers that are similar to the harbor freight model. I have been putting together an article and compilation of resources for building kayak trailers when I stumbled on your site. I have put a link to your page on www.kayaktrailersale.com I hope that's okay with you if not please let me know and ill delete it.

    Cheers!

    Andy

    Awesome project, can't wait to get started, I have the 4'x 8' HF trailer and will be using this as my build plans. I have 2 tandem kayaks to haul, 13.5'and 16.5'. thanks for this indictable.