Interior wall covers

I used KILZ for the primer, (also helps seal in odors)
Regular interior house paint over that.

I used the KILZ primer inside all the drawers, cabinets, on the walls, it seals in any color or stain that might bleed through.
It makes a nice base for paint.

Another question to add to this subject....

Would a certain type of paint have be used, in consideration that the unit will be flexing while in motion? Or, will standard interior primers and paints work? (I'm thinking that they will, but not 100% sure.)

I am a retired paper hanger. You can paint a primer over RV panels and then paint over the walls. Once painted, faux paint the walls to give in a two demensional look. Do a Google search to learn how to faux paint. Lots of info on the subject.

Note: stick house wallpaper is not made for RV's, it will tear or rip off with normal flexing when traveling. You can wallpaper a mobile home, as it is stationary.

A lot of people paint the walls of older RV's.
I would think that whether it looked cheap or not would depend on the painter. :)

And no it does't look stupid. Like I said it's very common on older RV's and Travel Trailers