Generac home standby generators in a sound deadening enclosure with ATS is available from most big home centers and are reasonably priced. They can run on either natural gas or propane by simply sliding a fuel selector. I would install one of those before I’d mess with the gen set in your RV.
I’ve had a 10K NG unit installed on my house for over 10 years, and it has been a godsend. I’m not powering any 240 volt circuits with mine, but could if needed. I have 16 critical 120 volt circuits powered by the ATS. It powers up the gen and switches automatically after a power outage, then switches back to utility power when it comes back. The gen does a test run once a week on its own. It’s run as long as 5 days straight after a storm knocked our power out.
Propane and NG never go stale like liquid fuels.
:):)