Is that the on from Lowes or is it a step up from there and something from a real trailer trailer store? I stepped on the corner of one and it seemed to twist quite nicely (mesh floor).I have a 5x8 Carry-on trailer. Tows well, seems to be built decent. I carry everything from furniture to lawnmowers. I upgraded the rear lights to LED. It has towed near the weight rating through several states without issue. I'm pretty happy with it, and would buy another if this one fell apart, which I don't think will. A friend bought one just like mine after he borrowed it a few times.
I suspect that is something I have to live with, since I can’t get a heavy duty trailer. Or I need to shell out some real money for an aluminum one, if I really want something more stiff.