It may be possible to modify your cable input (really, cable, not satellite) to work with your satellite setup. It requires an A/B switch and a bit of rewiring of the OTA/Cable switch but if you have no other splitter in the coach it's a pretty easy conversion if you have the tools and knowledge of working with coax.
A separate input is still the best option and you may find that there is a way to run another coax cable from some outside location to your receiver and use that when you need to.
What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?