We use a lot of Command Hooks and Strips to hang things in the RV without putting holes in the walls.  Now someone has created an alternative based on how a Gecko sticks to walls, including glass.  Here is an article on it - https://www.cnet.com/news/you-can-now-buy-geckskin-gecko-inspired-wall-mounts/ and a direct link to the product - https://www.buygeckskin.com/ .  I have not bought any, yet, but the products do look intriguing.