Why not weld some stake pockets on the side of the trailer. Then you can add some raft platforms. That is how my two trailers roll. My bigger black and silver trailer came with the platforms. I added a winch and some upgrades like aluminum decks. When I got my second raft, I added pockets and platforms to an old 4x8 utility trailer. I used 2x6's and 1 inch rectangular tubing and a few counter-sunk bolts to make the platforms and decks. I added some rollers from harbor freight to the back of the the 2x6's to make loading easier.
The platforms are removable or can be raised to two different heights so I can load coolers and dry boxes underneath.
I bought a mig welder to convert my grey and red trailer. It's super easy to use. It's like using a hot glue gun but for metal. If you can beg, borrow, or buy a welder it will really open up some possibilities for you.
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