An article in one of the RV magazine discussing ST trailer tires speed limitation of 65 mph unless they are inflated 10 psi greater than side wall instructions. I new of a 10 psi was allowable for LT for pickup trucks. Did a little investigation on the Goodyear Tire site and the following link discuses the speed limitation of ST tires. Marathon Inflation

Additional information as to tire care and storage can be found in following link. Tire Care

Gray Ghost good articals Thanks.

Erin