many newer coaches will have a pre-wired roof satellite antenna system installed, or a 'Satellite Prep' package for those coaches without an included roof top satellite antenna...
but, manufacturers don't typically pre-wire the coach for EXTERNAL satellite systems, like the KingTailgater or other 'portable' antennas. Since the COAX cable from the receiver normally is also the power cable for most portable antennas, the Booster, or black box, and internal coax splitters within the coach, create issues with the signal and power.
... while it's conceivable that coach manufacturers could engineer in these options, which they probably do for the higher end coaches, it's really better in the long run to have your antenna coax cables run DiRECTLY from the Receivers to the portable Antenna itself. Each tv and receiver then have their own remote and channel controls and no booster or black box connection is required, or has to be 'switched' to watch Satellite versus Cable/Antenna... the TV's Input/Source setting makes this change instead.
Running coax cable into/thru the coach is not as daunting as it may seem at first glance, though taking the time to 'engineer' it yourself takes some time and experience.
We started our portable system by just running the coax cables(2) into the coach thru a window for a while. As I got used to the system, I started to see other places where it would work better, be unseen or out-of-the-way, and be a more permanent solution.
Eventually I installed a couple of mounting 'studs' on the rear of the roof for the portable KingTailer2 to 'sit' on while traveling. This kept us from having the 'store' the unit while driving. The two coax cables are always connected to it, and run down the ladder, thru the rear radiator area, under the rear driver side, and into the wetbay, where they end.
The internal coax cables run from the wetbay(where they connect to the coax cables from the satellite antenna), up thru an existing entry hole for other wiring and plumbing into the coach under the kitchen cabinets. One cable runs back under the bunks and up into the top of the slide in the bedroom where the Receiver is mounted. The other runs toward the front, under the dining booth, and up to the living room Receiver mounted under the table.
If I need to, I can still move the portable Antenna unit, somewhere else on the roof if needed, or even down to the ground, since I left 20' or so of extra coax cable run around the rear AC unit... works great, though I hardly ever have to move it unless we are parked under trees, or near a tall building, etc.
So, it works like a permanently installed Antenna, but can also serve as a Portable when needed. While we also have a standard tripod mount 1000.2 DishHD antenna for use when parked for long periods, the automatic KingTailgater2 is much easier and quicker to set up for just overnights and short stays... sometimes I use it while the wife is shopping, makes her shopping more of a break for me!