Your not the only one and the system is not made by BCB. We did go to UFP/Dexter torsion axles earlier than most, though it’s a very common issue. The system has a lot of leverage on the arms and the impacts with curbs and obstacles can move parts just like tweaking the front end on your vehicle. Sometimes it not how hard though how you hit something to put your vehicle out of line. Tweaking the idlers is no different and everyone at some point curbs a trailer.
Last month a gentleman was in our office and said he’s never hit anything with his trailer, though he’s the third or fourth ownership. Everyone at some point has rolled one off a culvert somewhere making a turn or angle hit a curb in that same process. If this were a spring trailer it would have tweaked a spindle and bent it in those cases.
Some retorque them to 100-120 thinking thats enough, it requires the full 150 pounds of torque to give them durability.
BCB