[Motor31]

You nailed the solution. There are limited feeds into the switching box the factory puts into the rigs. An AB switching box is the solution for the coax choice unless you just want to swap coax feeds at the back of the box and that's a bit of a pain. On our rig I never did find the second outside feed coax wire from the dual connector plate in the water control area.

Do not try to use a signal splitter, that will degrade the signal. I removed the splitter that the factory put in and the broadcast TV signal is now viewable.