Good question, could be a faulty house battery disconnect switch, or low battery voltage that trips the disconnect switch. I'm not familiar with the set-up on Fleetwood products.
Hope you get the issue resolved, and when you do, please let us know what it was.
Best of luck, Jim
Jim & SherrySeward
2000 Residency 3790 v10 w/tags 5 Star tune & Banks system Suzuki XL7 toad