I had the hooks placed all over my last trailer for hats, keys, jackets, ect...with no problem. But then I put a few of these: Command Large Caddy in the trailer and they lifted/seperated the wallpaper from the wall. I carefully removed them and the paper stuck itself back to the wall with no sign it had ever seperated. I think these were just too heavy. But I do have several tin signs and a clock hanging with the command picture hanging stuff (like plastic velcro) and have never had a problem with those.
I was selling a 18' trailer earlier this year and wanted to get it cleaned up, without having to bring it home from the storage lot. I got a quote of $10 per foot, then he proceded to add it up 18'x2=36', then added the width of 8'x2=16', 36'+16"=52', so $520! I told him NO THANKS!
I bought a set of solar string lights. I don't have to worry about plugging them in and running a cord for them, and if the awning has to be closed they are just held in place by 3 clips. My solar lights also have a switch to turn them off when we turn in for the night. Now when we go to the beach I have 4 solar tiki lights that have a nice flickering glow to them, but they only go to the beach.
I think before you go out and buy anything you should try what YamaDooed & Hoosierdaddy47 suggestions to insulate behind them. I had a bad vibration on my ceiling mounted monitor in my truck so I put some of that thin foam sheets that your tv or new monitor is packed in for shipping up behind you speakers, they are probably just vibrating the thin wood they are mounted to.