IMHO and having Had RVs with gas, diesel, and propane generators, I have found pros and cons of all 3. Propane would be my choice if the generator would not be used often. I currently have a propane backup generator on my house. I don't have to worry about it starting no matter how long it has set. Gasoline generators are a maintenance headache if they are only used a few times a year. The biggest drawback to traveling with a propane generator is fuel transport. A 20# cylinder carries about 4 gallons of LPG with considerably less energy than gasoline. I had a 6.5KW on a fifth wheel. It went thru 2 30# cylinders in less than a day running 2 ACs, a refueling headache. Watch the manufacturer's derating of operating dual fuel or propane conversions and make sure you have plenty of capacity to start everything. Only generators I have had refuse to start were gassoline, and that was due to sitting fo over 60 days. That said, I currently have a 7.2KW power supply on my pickup, so I think I have now tried everything.
