I have a solution for you but the etrailer Hitch Mounted Spare Tire Carrier item # e98ZR and other comparable spare tire carriers at that price range aren't rated for motorhome wheels/tires. The main issue is that the mounting system won't accommodate wheels with large bolt patterns like 8 on 6-1/2". That carrier can only support up to 6 lug wheels that weigh under 121 lbs.
For your Jayco 32 foot Class C you will want to use the Roadmaster Hitch Mounted Spare Tire Carrier item # RM-195225.... view full answer...