I have loaded mine up w/ more crap than you can believe.most recently I put 56 ft of 6' high x 8' long fence panels on it, plus 4 10' 4x4's and 12 60lb bags of concrete mix. then the trailer had 11 8' 4x4's and 24' of fence panels. and the other 7 bags o cement.
I would have put more into the trailer, but the tire was deflating in a hurry.
I have put over 1K lbs of tile, grout, thinset and backer. I routinely load the family in for a long weekend of camping.
And I hit the scales @7880lbs gross w/ this load....