The back axle on our travel trailer is bent back so that the back edge of the rear tire is 1.5" out of line with the front ones on both sides. The right rear is also 1.5" out of plumb.The left not as ...
If it has the BAL frame I think it does, it won't be a frame related issue. TT axles are paper thin and it doesn't take a lot of potholes or curbs to cause damage.
Expect for what to do about being 1K miles from home, I would upgrade the axles to the next rating. I was just talking to someone at a CG who had bent axles (3500 lb) from new and he got them upgraded to 3" axles and for 5-bolt rims (so he didn't have to replace the brakes/wheel).