I keep a roll of the velcro that sticks to itself, loops on one side hooks on the other around for projects.
I made two straps that I put around the awning on our B just as extra insurance that it doesn't open going down the road.
We have two jackknife couches that makes a full width bed. The crack between the back and cushen when folded down was uncomfortable to sleep around so we bought two self inflating air mattresses, one for each couch and they pretty much fill the width. Problem is where to store them in a 19' B. I put a single loop tie down on each wall at the end of the couches and used a strap of the velcro to strap them vertically to the wall out of the way.
Another piece of the velcro material secures the power cord in storage.
Used stick on velcro to secure the remote for the refrigerator thermometer so it and be by the frig when camping and on the dash when going down the road.
Probably more velcro in the camper but those are the ones that come to mind.