This may well be normal operation. You cannot tell for sure until you pull the unit straight ahead for a bit and have the truck and unit in a straight line, when you check. If you backed into your storage spot the axle will move slightly on the hangers and will not move back into the correct position until you pull the unit forward as I stated.
Make sure your new tires have sufficient capacity for your load I would recommend at least 15% more load capacity than the max expected load.
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Chuck & Sandra
Engineer/Teacher
2010 F350 CC 6.4
2015 Prime Time Sanibel 3601
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