Could be a redundant way of storing it, steel belt(s) could be broke, etc. Take it off and take the wheel and tire both to a tire store and have them do a balance. That will give them an idea of what's wrong. Could be excessive road force which essentially means the belts have broken away and needs to be replaced. Improper inflation and out of spec alignment can cause uneven wear as well. I doubt if anything is wrong with the axle, to be honest.
2013 Jayco Eagle 328 RLTS
2013 Ford F350 6.7L 4x4 CCLB W/Air Lift air bags
2002 Coleman Bayside Elite (traded)
Me, Momma and Charles (RIP buddy)
And introducing Sofie!! ;)