I've hammered my Harbor Freight bike hauler, on some pretty bad mountain roads, with my bike on it. Before I used it, I welded all the fasteners, so nuts wouldn't vibrate loose/off. The nuts are Nylocks, but I welded them anyway. The ultimate test, was hauling my DR 650. I would discourage that much weight, but mine survived fine...for what it's worth.
**I use a safety leash around the swing arm, attached to chain catch on the hitch...I once saw a bike come loose and nearly tear away the straps from the bars**
