If your motor home is used the satellite dome may be bad and the dealer did not want to tell you OR he may not know how it works BUT it is doubtful the last would be the case if you got it from a Fleetwood Dealer as they would be very knowledgeable of the various systems.
Winegard domes work with all the sat systems and they are very good antennas. With Dish you can use the receiver from your home in the MH while traveling w/O additional costs...OR for about $7.00 additional you can enjoy a different receiver just for the MH and not worry about moving your home receiver.