I had the same sort of problem with Jeep GC lug nuts, but only after say 125K. A local Firestone store tech cranked them down to 210-240 ft/lbs. (versus the light 110 factory spec) on the 2012 Jeep GC we gave our daughter. Also there was general impact wrench damage to the extent that the store manager bought 11 new ones--these were too long and too heavy so I bought a complete set of Gorillas online and gave the partial set back. During back and forth discussions, I discovered that the Firestone service manager did not know how to determine that lug nuts were overtightened using a common "clicker" type torque wrench. The store manager knew how to slowly click up to the overtighten amount using a "clicker" and confirmed the above numbers, but the staff apparently had not been trained. At later visit, I barely stepped into the service area and did (back at a safe distance) a been there, done that, older guy training session for the service manager and the young techs. Earlier the service manager was throwing all sorts of insults my way---told him, "Hey, I learned how to properly use a torque wrench 20 years before you were born". Bottom line is that the good factory 7/8" lug Jeep GC lug nuts can fail too with mistreatment---but from much experience with two Jeep GCs, they are way more durable than the above total iffy Ford Expedition jobs.