Sorry you had trouble with your Jeep. But this sounds like a problem from the factory not with anything you have done in the towing area.
YJ's and TJ's do not have electronic front hubs. They don't even have so called hubs in the front or rear. The YJ has a split right side axle that engages and disengages with a vacume motor when going from 2wd to 4wd. In the TJ they eliminated the split axle and simply rely on spider gears in the front differential to allow the wheels to spin independently.
My guess is that when the axle was built they either put too many shims or not enough shims on the sides of the spider gears or had the play for the ring and pinion incorrect causing premature wear in the differntial. Once they get it right you should have many years of trouble free service out of your TJ unlimited. Good luck and happy RVing/Jeeping.
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