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I would run a cable through a window or the door directly to the main tv and go through the tv scan steps. If it works, you have isolated the problem to the coach wiring, splitters, or the amplifier device.
If the problem is in the wiring, then I would disconnect from the amplifier and run a cable from there (bypassing the amp) to the tv. That will test the cable from the outside port to the amp. If the tv works, then the problem is somewhere between the amp and the tv's. That's when chasing down that other splitter becomes necessary.
If you've tried 3 different cable sources, then I doubt that it is the QAM tuner issue, but could be if all three cable providers require a tv with QAM.
You can also take a different tv to the coach and test the wiring as outlined above.
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