Keep in mind that clumping kitty litter turns into 'concrete' when wet. That stuff goes down your shower drain and will clog the drain and leave concrete balls in your tank.
I placed the litter box
'inside' a soft sided small crate with paper on the bottom of it. NONE of the cat litter got outside of it into my MH. It all remained inside the small soft crate. It sits in the back of the MH on the floor.
Best part is you can use it to put your cat in when you don't want it to get out of the RV and they won't mind because it has screen openings all around for them to look out. AND it folds completely flat into a 12 inch circle when not in use! 20 bucks at Walmart!
My cat also rides in this crate anytime we are on the road. Cat box at one end, his bed on the other end. He's happy, I'm happy, and no litter dust in my MH. :C
https://www.cleanrun.com/index.cfm/product/482/sport-pet-pop-open-crate.htm
We must be willing to get rid of the life we've planned,
so as to have the life that is waiting for us.