Here is another situation to think about and this has happen to me, but i was just three miles from home. What happens if you loose a bearing on one of the camper wheels, you are in the middle of no where, no extra parts, what do you do? The camper can not be towed for any long distance, the three tires that are left will not support the weight of the camper for any given time while towing.
I was lucky for being close to home, my wheel bearing was smoking, i stop to let it cool down after a while i tow the camper home, as i was backing up into the drive way the bearings were falling out of the wheel and on to the driveway, i ended up having to replace the axle.
I called the service dept at the dealer which is about 30 minutes away and ask them if it would be safe to tow the camper to there shop for repairs in the condition that it was in and they said NO, they said if i was to remove the wheel with the bad bearing and try to tow with just three tires on it, the side with just one tire could blow and this could cause more damage to the camper, they said that the camper needs all four tires.
I had to replace the axle at home, that was another experience.
Just something else to think about