I just replaced two sets of wheel bearings after 10,000 miles on my Keystone Alpine, 2012. I had about 6000 miles on it before my last trip and while preparing for that trip I checked all wheels. I ...
It happens, and always a good idea to check everything before a long trip. I have a car trailer that was the same way, got 15k out of the first set of bearings. Then had do the same on both axles.