guitar-man, make sure that your axles haven't slipped and rotated, which allows the tire to rise into the wheel well. It has happened to countless campers, and most don't even know it.
That bolt/nut that we see in your pictures is supposed to clamp the axles in place, but doesn't have nearly enough clamping force to do the job.
Check at the front of the axle mounts, where they rest us against the camper frame. If there is any gap there, they have slipped.
Let us know what you find. If you are not sure what I mean, could you take a picture from the front of the axle mount, rather than the side shots you have provided?