Stick to the weight limit. On my Pacific tour, I ran into a few folks who had to have them re-welded during their trip. All had exceeded the weight rec.s, but not by a lot. Also, all were rigid, which probably had something to do with it.

This was almost a decade ago, so the design may have been improved. I also had a BOB, and no problem, but it is the squirreliest trailer I've used when descending at speed (but the best tracking in all other conditions).