Hilary, I have no concern whatsoever about the wheels. One of the bolters recently observed that if you put a 3600 on a tandem trailer with four of the same trailer wheels, you would be carrying the same weight as the truck wheels carry. Granted, some of the forces are different, but when you look at the 3700# ratinmg, the construction, and the welds, it is hard to imagine there would be a problem. That said, I do inspect the wheels regularly, and I would be the first to go in another direction at the slightest indication of a problem. The truck is not subjected to a whole lot of stress. Back in the day, if you loaded up a ton of stuff and went bouncing along the rutted roads, maybe that would be a different story. Your call.