Just returned from a trip pulling 6900 lb travel trailer over a couple mountain passes in CO. I replaced all four rotors and pads a few weeks ago and have towed a couple times since without issue. About three miles from home, off interstate, I experienced some wobble. Pulled over, found two lugs sheared off on rear drivers wheel and missing one lug nut on the rear passenger wheel. I have since pulled the rear wheels and encountered one more sheared lug and one cross threaded lug. I am unsure of the cause of all of this and looking for thoughts. I do have a torque wrench and torqued all wheels to 97lbft and confirmed my fronts are in fact still at that from when I did brakes all the way around. New rotors and pads are Power Stop Z36, or something. Aside from the matter above, I have found the truck to pull quite well and be geared good. It's a 2011 with 5.7 and 160k and generally runs well. Thanks in advance.
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