From what I read, gasoline is more efficient than LP. And while twined Honda gennys are nice and easier to stow etc., they are not going to be as simple as holding the start button for the Onan. My wife starts ours easily. Hit it and let it rip.
You can get some OEM and 3rd party remote starting options for the portable generators but you will need to get them setup for use each time - prior to giving her the remote in case gen power is needed.
That said, if it was just me RVing alone, I'd opt for a large portable or maybe twinned Honda EU2000i gens. Weighs less, takes up less space and is easily used for other non-RVing events
eek: blasphemy).
Jim