Follow-Up:
Yep, our 1995 with only 20,000 has a Generac and is driving my husband nuts! We bought our Rialta used this year and the generator didn't run good at all at first, he fooled around with it and now it runs better but nothe as smooth running as he'd like. It seems to have the hardest time when the air conditioning is running. He is trying to find some more information on it all the time.
Here is a link that might be useful: How about a vacation in Panama City Beach?