We just purchased the 2012 Eagle Superlite 315RLDS. It was used by Dealer for two vacation trips but never actually sold to a customer
Came on 16 inch rims with GY Marathons
Trailer was built in 2011 so I built in the cost of 5 x Michelin XPS Rib tires with the better half.
Checked with Jayco and the rim manufacturer and was good to go for 80 PSI on the rims
so the original Marathons where LR D 65 PSI max The Michelin's are LR E 80 PSI Max
Yeh the Michelin's are expensive but I am not going to worry about them blowing out. I have had great luck with Michelin tires for years
As a bonus the new Truck came with Michelin LR E tires on it from the factory Running them at 60- 65 PSI as there is less weigh on the total truck than on the trailer axles
Truck and trailer work well together no issues so far