There was an article on installing a winegard satellite in the Camping World magazine a few month's back. The roof part was pretty simple they just ran the power/coax cable down the same point as the coax from the antenna. IIRC they put it on a 5th wheel and the tricky part was running the coax to both the interior living area and to the bedroom. Had to run the cables into an interior wall and from there underneath to get to the bedroom. Took the pro something like 5 hours to install, so that wouldn't have been cheap. I would think installing to a single TV would be a lot simpler.
2011 Chevy Silverado Crew Cab 4X4
2009 210 WBS