for really hauling stuff around, I highly rec. blue sky cyclecarts. We've got three of them in varying sizes (the small one has phil wood racing wheelchair wheels and high pressure tires and I barely notice that I'm dragging it) I'll put up to 400 pounds on one of these (rated to 200.) Ours are reinforced with steel skid rails on the bottom and leather patches on the corners of the fabric. Waterproof and super tough. I can also send anyone great plans to build their own trailers (nice strong ones). Plans are free, parts are about 40 bucks.