Wow, I'll try to give you as mush info as I have right now. (Till Monday).
I loaned a 7,000lb car hauler.
I went to get it the next day. The guy in back said one of the guys thought the wheels bowing in and out must be some new kind of suspension. My eyes got wide. I asked how much weight they put on it. He said 5 - pallets. So, he and I went and looked up how much the pallets weighed. (I was surprised that he didn't know) 1300lbs each. I told him I thought the bowing was the axles bending.. I took the trailer home. It did act as though it tried to apply the brakes a coupla of times which seemed strange. I did not inspect the trailer at that time.
The next day, they called and said they weren't quite done with it. I told them what the guys in back had done and asked them to be sure this didn't happen again. They came and got the trailor. A few days later, I had my gal give them a ring and they said they were hoping to get it back out of the shop by the time I called for it. They had broken the axle. They offered to bring me there trailer if I needed one.
That's about all I know for now... These are really great folks and I hate that this happened. In any case, I'd imagine I'll just get the trailer back and have it checked out and foot the repairs myself. I'm sure they've not enjoyed this any more than I have.
I'll also take it by the tire guy and have him check the tires..
I just got the brake installer installed. Now I'm more scared to load the tractor than I already was... LOL