Our 242RESL had the same sticker on the bedroom (outside) wall. I struggled over what I was going to do and then simply used a good quality screw that was 1/2" shorter than the thickness of the wall. I then used double sided velcro to make a strap so I can cinch it to the wall. It's a 19" that we have in there so I'm not expecting any problems.
"We were not placed on this earth to see through one another, but rather to see one another through!"
2013 Timber Ridge, 2013 GMC Sierra 6.2 L