Just discovered our 2018 GC Trailhawk has one tire with tread damage, non-repairable. Tire dealer said we had to replace all four tires, a very expensive proposition! 18,000 miles driven, maybe 3000 more miles towed. Can someone help me validate the need for replacement of all four? Also looking for recommendation of new tires if they are right. We generally don?t off road much, but we like class 1 and 2 roads. The Jeep is totally stock. I am particularly interested in tires that can be aired down for a softer ride on washboards.