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Picture of Quick Sides for Small Utility Trailer
This method of constructing solid, wooden sides for a small utility trailer uses a minimum of materials and requires only an hour or two for assembly. We found all these materials on hand in the shop. This concept may be adapted for trailers of other sizes or where other materials are available for use.

Step 1: Fabricating the Sides

Picture of Fabricating the Sides
Determine the desired height of the sides. We chose 16 inches simply because there was a supply of +/- 33 inch plywood on hand in 3/4 inch thickness. The boards are first ripped to this height (width), then cut to length. The front and rear boards run the full width of the trailer while the side boards butt up against these. This allows for more fore/aft strength and security.

 
That is a cute lil trailer you got there. I am currently working on a slightly larger travel trailer, and found this project while looking for ideas. Thank's for the post.