Making a dual jet ski trailer from a boat trailer
Topics: DIY

I bought an old boat trailer and converted it into a dual jet ski trailer.

Boat trailer

Originally, someone stripped this boat trailer in preparation for making a utility trailer. They gave up on the project and I bought it for $250.

Design

jet-ski-trailer-11
jet-ski-trailer-10
previous arrow
next arrow
jet-ski-trailer-11
jet-ski-trailer-10
previous arrow
next arrow

In Solidworks, I added the rails for the jet skis to sit on and adjustable winching mechanisms.

Coupler

jet-ski-trailer-03

Before

jet-ski-trailer-07

Electrolysis in progress

jet-ski-trailer-05

After

jet-ski-trailer-09

Painted

jet-ski-trailer-15
previous arrow
next arrow
jet-ski-trailer-03
jet-ski-trailer-07
jet-ski-trailer-05
jet-ski-trailer-09
jet-ski-trailer-15
previous arrow
next arrow

I cleaned the coupler using electrolysis with excellent results. A few months later, I bought a new coupler because the original was simply worn out and very challenging to get mounted.

Winch

jet-ski-trailer-12
jet-ski-trailer-14
jet-ski-trailer-08
previous arrow
next arrow
jet-ski-trailer-12
jet-ski-trailer-14
jet-ski-trailer-08
previous arrow
next arrow

I bought two hand winches and two rubber bow rollers. I used square u-bolts and 1/4″ plates to make an adjustable design. To fit different-sized jet skis, they can be moved up/ down and forwards/backwards. This can also be used to adjust the tongue weight.

Other details

I added a trailer wiring kit from www.etrailer.com. Compared to Amazon, they have good quality, waterproof kits that don’t dry rot after a few years.

Finally, I added a spare tire with Attwood’s tire carrier.

End result

jet-ski-trailer-13
jet-ski-trailer-02
previous arrow
next arrow
jet-ski-trailer-13
jet-ski-trailer-02
previous arrow
next arrow

This trailer turned out really well. In total, I spent about $700. It’s certainly longer and heavier than most jet ski trailers but it’s been reliable and sturdy.

One thought on “Making a dual jet ski trailer from a boat trailer

Leave a Reply