I'm a new member to this board, today as a matter of fact. I too am planning on building an expedition trailer. I found an older, small utility bed in pretty good shape. I plan on fabbing my own frame, buying an axle with Toyota lug pattern to match my FJ Cruiser, and ultimately putting a roof top tent on top of the trailer. I found the utility bed for $200, but had to go about 4 hours to get it. I like the idea of waterproof, lockable compartments.