Was the tow vehicle hooked up when you checked the wheels for freedom of movement?
If not I would hook it up and check the wheels again with the trailer connected. There could be voltage being applied to the brakes on that side. I would also pull the wheels and hubs and check for any obvious mechanical issues.
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
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