Well after running the engine and generator during the winter, and our last 4 hour round trip, the fuel tank was down a third. So today I went and topped it off again, about 30 gallons.
Started the generator again and turned on both air conditioners. We then took it for a 45 minute ride on the freeway and back to the storage yard. MH ran great, the air conditioners worked fine.
So after parking with the gen still running and air on I went out a took another look. No smoke or smell. Everything seemed ok. So maybe the fresh fuel worked, or just needed to run more, or there was a little water?
But thanks for the help, I'll be keeping a eye on it.