I went from 15" to 16" rims/XPS on a Jayco 300FSS TT. Blew 3 of the factory supplied tires the first year which were loaded to 90% of their capacity. I don't remember the size of the XPS, but it was close to the physical size of the 15" tires. I had to be specific about the stronger, 80psi rims.
The XPS were E rated and had a stiffer sidewall than the D rated that came on it, which made the TT handle better. Seems the loaded TT weight was about 10,800#. Probably ran the XPS 20K mi. when I moved to a DP. It was an expensive trade-out, but what's confidence worth traveling thru the AZ desert?
