Guys, just fyi, here's a simple video showing what they do and what they don't do.
https://www.youtube.com/watch?v=_E2xOoNov9s
Again, very useful on the boat, (it's hard to be careful with stinky slinkys when the boat is moving up and down at the dock).
As for RV's, I don't have one because the AF1150 has a great bathroom, but could be useful, especially if boondocking a long time.