Maybe not as much experience as others but we are heading out on a 15 month journey and our original tires were on our two year old trailer - granted they were the China bomb type tire, but we replaced them this fall before our journey begins. Within the first two months of our journey we are going to hit several dirt roads, towing our trailer, including the Top of the World in Alaska. We ended up purchasing Carlise Trail HD's - an 8 ply tire I believe. We bought 5 and paid under $1000 Canadian. So far so good, and the peace of mind is priceless.