Makes no difference if it's diesel or gas.> Mine is a gasser. 22.5" mitchlin XRV's were factory.. I priced them through FMCA at I think 3500 for six plus install (I got them cheaper straight up here in SC but that's another story. I may have gotten a deal as the tire man owed me big time from another job I got him on a dead semi.. long story).
I went with TOYO's they are less than 1% difference in outside diamater (So the speedometer is still close to accurate. less than one mpg off at 100 MPH and this house won't go that fast,,, not even down hill with a tail wind... tested (ok so I did not touch the accelerator peal but it peaked at 82mph)
2230 for six of 'em as I recall.. Straight up (Last October). only dropped the Motor home one time while installing them (No damage save to their parking lot.. kind of funny story).
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times