Satellite Pre-Wiring

What we do know is that the coach is NOT pre-wired for an RF Mogul antenna. This antenna is excellent but requires a separate, RF Mogul only, cable. The same is true if you wanted the Winegard Trav'ler (my preferred choice). It's likely the "pre-wire" is for a dome antenna and one coax would run from the "main" connection of a dome to the master receiver and the 2nd could or could not be used but would go the 2nd slave receiver if one was used.
It's pretty easy to run the required cable for your RF Mogul so that should not be a reason not to install the antenna.