A) you must run directly to your receiver(s), using the internal 'cable' coax connection will not work as it has splitters in line that will not allow the receiver to communicate back to or power the antenna
B) you must attach each separate Receiver by coax to the outputs of the antenna - splitting the 'signal' will not work, which is why there is two outputs
C) your don't have 'framing' in the coach walls as you might think of in a house - no factory wiring is run thru the outside walls, but instead thru the rear of cabinets, usually behind 'false panels', etc. Sometimes wiring may run down from a interior wall to a wall switch, but usually this does not include coax wiring. Factories are very creative in how they find places to route cables as outside walls will not work.
if you're like most of us with Tailgaters or similar antennas either on the roof, or mounted on the rear ladder, or just stored and placed outside on the ground when parked, running your own coax directly from the antenna to each receiver is the best solution, even if you have to get creative on how you do it.
I have two methods, as I have a place on the rear of the roof where my KingTailgater2 can sit while traveling, and be used from there if the view is not obstructed where I park - the coax cable run several times around the rear air conditioner cowling, and over the edge of the rear bedroom slide corner, thru the seal, and into the top of the bedroom slide roof, over the trim and down where my bedroom (main) receiver sits on top of the bedroom cabinets.
I also sometimes need to move the antenna down onto the ground, so I also have a coax cable that I can use that simply is pushed thru the bottom of the bedroom slide's seal, when the slide is out, and up to the receiver location.
I do the same for either the living room RV/receiver, or the outside one.
two Campers, two Electric cars
former diesel pusher traveler