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I have a 2018 3790 that had the same problem starting in summer of 2020 kDiver's side). Made an appointment with a heavy duty alignment specialist (big smi trucks & trailers. Rear axle was out of alignment by 2.5 inches. Recommended replacing 7000# axles w/8000#. Problem was in the supply chain. 12-16 weeks w/no guarantee of delivery. I said do your best as i was headed south. They got within 3/8ths to 1/2". Bought 2 spare tires to travel with. Went AZ & back to central ID. Normal wear, returned spare tires. New Axles finally arrived in mid May. Debating wheather I'm exchaning them now. Oh a original diagnosis & staighten was less than 4 hrs at $250. New axles about 1100, if i go that way. Go to the pros is my advice. I'm still happily schocked.
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