Mike
My HF problems were a combination of cheap communist fasteners and poor design. The steel was too soft and thin to let the bolts get fully torqued; if you can't tighten a bolt enough, it's guaranteed to fatigue and fail. The design uses bolts in tension, with threads where the pieces join. That makes a slow speed milling machine, just cutting away at the boltholes. Neither trailer was overloaded or taken off road. The third trailer was an IRD design open-rail car hauler I welded up myself. This was a great design, but I had it out in the Florida keys, where you just can't get more than a yard above salt water. The catalyzed epoxy paint looked flawless, but the inside of the tubes just got eaten away