You only have about 2 choices for an onboard genny, Onan or Generac. A number of years ago, Honda made an onboard RV genny. It was water cooled and never really got established in the RV market onboard picture. If Honda would bring out a genny to match the size, etc. of aforementioned gennys, those two would be out to pasture. I have an Onan Marquis Gold 7000 gas in our fiver. It will pull two AC's, hot water heater and numerous other things. But one thing to remember is an Onan is like an old woman, needs a lot of TLC.