yep, a tv is just a tv, unless your Bedroom tv is the Jensen 12v type, but even then, you may have an outlet behind it to plug any 'regular' tv into if you replace it. My Palazzo has the Jensen, I suppose to allow the owner to be 'off-grid', without the inverter, and still be able to watch 'ota' TV, because the antenna is also 12v, but mostly we just watch it like any of the other 120v 'regular' tvs, and don't really know the difference.
I'll say that, yes, wifi or cellular connection to the net is going to be the prohibiting factor to 'smart' TVs, of any size or variety...but if you have that worked out, then they'll work just like anywhere.
You'll find subjects on cell and wifi sources all over this forum, as the internet continues to be one of the most challenging things when it comes to being 'mobile' in your RV, and most campgrounds and rv parks don't really want everyone 'streaming' movies every night, at least on their dime.
now, as for the couch, you'll have to share with us 'what' couch type you have.
'14 Palazzo 33.3 bunkhouse 34' diesel
KingTailgater2 Dish HD, 100w/5a SOLAR, BlueOx
100,000+mi since '14 - US, Alaska, Canada.... formerly Georgia, then NorthCarolina, now Alabama : )