I need new rear tires for my 3500 HD. 19.5 load range F tires are expensive and my tire shop has re-treads for half the price, and with a better lug pattern for winter traction. Has anyone used re-treads with bad results? The guy at the shop said they have never had any de-laminate and there is a 3 year warranty on them. He also said as long as I'm not do OTR driving for 6 hours or more on a 110* day, the tires should hold up fine. Any thoughts?