What a timely post. I have an update to report. After extensive investigation, Fleetwood has come up with a fix for this problem. It consists of two separate fixes.
1) They are re-routing the exhaust to the back of the motorhome to help keep the generator cool. This is such an obvious thing that I'm surprised they put it in this way to begin with. A closed door blocking the generator right behind the chasis engine is bound to get hot so re-routing the exhaust will clearly help.
2) They are installing some sort of device to prevent vapor lock. From the way they described it, it is some sort of T-valve that allows liquid fuel to continuously cool the fuel near the carburator and prevent the gasoline from vaporizing. Even if it does vaporize, the continuous flow of fuel should prevent the carburator from sucking dry. I am having a hard time understanding how this device will work but will hopefully see it installed soon.
I will keep you all posted when I get the coach back from the dealer in a few days.