I was looking at VeCOAX mini mod 2 a few months ago, and I may come back to it in the future. It takes an hdmi changes it to a tv/ cable Channel, combines it with other cable or antenna channels on your existing coax system. It should in theory keep the 5.1 surround sound as well, but I do not know that for sure. If all your devices ( Sat, Blu-ray, Roku etc) run into an hdmi switcher before plunging into the VeCOAX you could use any device on any tv on the RV’s coax system (one device at a time) or watch antenna or cable on any other tv at the same time. It looks pretty cool.
They have several models with different options, but this one seems to fill the bill.
https://www.amazon.com/dp/B07G5K1ZV2...v_ov_lig_dp_it
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2002 Country Coach Affinity 42' #6063 CAT C12 505hp & Matching Featherlite Trailer or 2009 Lexus GX Toad