You could have issues with some parts availability but the important stuff is used in all rv's. (refrigerator, water heater, stove, etc) If you have a warranty then it will be with the dealer and not the manufacturer. The engine, transmission and chassis are probably generic to other rv's also and can be serviced by any reputable shop. If the rig is in good shape It would not bother me that the brand was no longer made.
2007 Fleetwood Bounder 38V