The frame is 4" channel iron (I think that's what you call it) except at the far rear cross bar and was sturdy enough to haul a large skid steer with attachments for a long time. I'm going to be bracing the frame at the rear more, since it will see a larger area of weight than the skid steer laid down. The wood is "kiln dried, heat treated lumber", and after I get everything cut and drilled where I need it I plan on treating it with a weather sealer. Here is what I got done today:
Laid the wood out just to get an idea of how it will fit:
Cut the rear section off:
Cut alot of excess metal off that was sticking up:
Welded in a piece at the far rear for the ramps to attach to. Going to be using a larger brace just forward of this area to run the width of the trailer: