The DTV standard for over the air broadcasts requires a good and stable
incoming signal from the antenna. In the RV if you are parked and can
orient the antenna you should be fine. If you want to use it while
driving, it is not going to work. There will be too much 'ghosting' of
the incoming digital signal and the tuners won't handle it well.

I am not certain there will ever be a market segment for what you are
searching.