many pounds they'll hold. You can remove them without damage to the wall.
I am using several (the ones that say they can hold 7 lbs.) in the shower to hang up items to dry...towels, washcloths, and even a plastic bag of dirty clothes.
soap and spray bottles, scrubber, etc. They also hold a bag of doggie "bags" and leash by the door.
You might find all sorts of places to use them in the rv!