This is what I love about this group! Most of us read the problem, look over the pictures, and put our collective opinions and experiences to work to find a solution. In this case, It would appear that the bent rim was the problem, however all the extra sets of eyes revealed what appears to be a crack to the OP’s attention. This can possibly prevent some future tragedy.
I remember one time a few years ago when someone posted pictures of their new X Chocks in use on their wheels, and someone posted that something didn’t look Right... he had noticed in the picture that Both wheels lug nuts were installed backwards with the acorn taper facing out.
Thank you to everyone that has helped me over the last seven years or so that I have been a travel trailer owner and member here