I've hauled a lot of stuff in the past few months with this thing and I love having it. Only one camping trip on the tires though, I moved and haven't had the time to get out there. I know that it holds LOTS of heavy car parts(engines, Trannys, Axles) though. Hit the scale with it fully loaded: 1200#'s the trailer weighs a little over 400.
Couple things I would change though:
Thicker sides and floor. 14ga instead of 16ga
Completely weld the frame, tailgate, etc. before putting the skins on.
Get all lid shocks, suspension set-up, hinges, latches, etc. in position and working before skin and paint.
I broke my fingers the other day, the lid came down on them and I have decided that it would be a good idea to get those gas shocks on there.
Any suggestions in the mean time about, mounting angles and projecting lift weight, would be helpful/welcome. I am researching shock suppliers and the like as well.
Cheers.