I had 6 Power Kings under 13k of boat and trailer that were 14 years old. I did not have a lick of trouble with them. I replaced them with 6 new power Kings Same result, sold the boat and trailer with the tires being 4 years old. On the HTT I have 7 year old Carlisle's that are showing now signs of where of cracking, but I keep them covered when not in use. The previous TT has Goodyear Marathons, those tires where moved from the TT to my car trailer and are now 12 years old and still rolling on. The replacement tires on the TT where Good Rides. What ever tire you buy run it at the max tire pressure and make sure they are rated for the load.
