Recently completed a 4000 mile trip towing a 7 ton 5th wheel, the last segment of which brought me back over the Donner Pass. While cruising down highway 99 (central CA), less than 100 miles from home, the tread on my right rear tow vehicle tire separated, but didn't blow. Sounded like someone set off a stick of dynamite in the bed of the truck. Was able to safely manuever off the freeway to a side road. Spare was mounted and was on my way in about an hour. Damage to truck was near $2,500, but Goodyear made good on my claim after completing a bushel of paperwork and signing a release. Tires (Wrangler, LT 245/75R16) had nearly 39,000 miles, but lots of tread wear remaining. I'm just grateful that the incident didn't occur in the mountains and that the tire didn't blow. Probably will not replace tires with Goodyear.