I have a Onan 5500 LP that I use for overnighting and rest area stops. It works great. I have had no contamination or gumming issues. I do not need to carry gas cans. My RV can from the factory with 4-20# tanks. I have plenty of LP for overnighting. I seldom go off the grid or boondock.
For overnight and occasional use my 5500LP has been great.
While I respect Doug's opinion and experience I've seen had far more issues with gas gensets with stale gas and gummed up carburetors vs. lp issues.
Carrying,storing and transporting gasoline is a much bigger concern for me than contaminated propane.