I can understand the difficulty of finding propane. I just exchange two 20# cylinders every weekend before I go out when it is wintertime, or one when it is summer, so I don't worry about running out.
Of course, when I move to a motorhome with an actual tank that is permanently mounted, finding a filling place is going to be a PITA. U-hauls supposedly have it, but someone trained to fill propane is usually not on site (so they claim), the propane companies won't lift a finger unless you are willing to sign a contract that you will buy 500 gallons in a year.
So, this leaves RV dealers and RV parks. There are some decent dealers, as well as RV parks, so this is an option.
Of course, the backup plan is an Extend-A-Stay, so I can use exchangable cylinders as opposed to the propane tank.