There is always someone who says "No such law" and then ends up proving there is (The expensive way) when he pays his fine.
I, on the other hand, have the Michigan Vehicle Code on my hard drive. (Much less expensive. (As in free).
Suggestion to the original poster.. This is about as easy as it gets.
In my Class A there is a "Euro Recliner" which is not to be sat in while in motion (no seat belt) Great place to "plop" a portable TV, well behind the driver, Below the window line so ye-old-underpaid and overworked can't see it and directly across from a pair of seat belts which is where I'd be parking the young ones.
I added a 12 volt outlet (There is 120 volt inverter provided nearby) and a TV outlet in the galley cabnet wall beside it. A common packing strap can secure a portable TV in said seat quite nicely,. Kids happy, Driver happy, Cop underpaid and overworked. All is good.
PLUS.... you can use the same TV on the pignic table (That's picnic table where folks make pigs of themselves) should you wish. (just add a splitter in the line to the TV outlet I mentioned (I DID) and a 2nd connection in the basemenbt (I did)
My portable fits in the basement in fact.. Used it there many times but now it's playing "Picture in Picture" with my other new "main" computer. (This is the primary, it was orignially my main one) My old bedroom TV/Monitor had "picture in picture" (Could watch TV while computing) The new one (The old one died, as did the old computer, at different times) has not that feature. So I put the portable beside it cause when I'm using that computer it is mostly mindless stuff and there is danger of my falling asleep if I don;t have the TV feature.