Actually, it's a good question. I have heard that any single ply will work. I use the Scott brand and never had a problem.
I have also heard (but cannot verify it as fact) that Scott's and like paper is actually better than some of the RV kind. We know it's cheaper, for sure.
Only the really big rigs that can hold a month of the stuff may need biodegradable expensive stuff. In our small, you gotta empty it regularlly I don't think it matters as it ain't there long enough to biodegrade anyway. We use Scotts as it has been widely recommend B4 on this site.
Suppose that any brand of one ply that comes apart into bits when a couple sheets are put into a jar of water and shaken can be used without a problem.......don`t have to get the $$$ RV stuff....Benny
Even when I lived in my stationary travel trailer full time, I put the TP in the garbage each time. A friend stayed in it for a couple of weeks and came home to a holding tank plugged full of TP. (forgot to tell her) When using my wee Ventura TV I still just put it in the garbage.
Hi: All...Wee use 1 ply "Recycled Paper"!!! Don't ask me how they get the stuff out of the paper and the sheets so nice and flat again after being used once... but it works for us!!!
Alf S. North shore of Lake Erie
Keep your eyes open at Christmas time. You canusually find some neat rolls in the "Everything" type store that have jokes on each sheet.
Gives you something to do while waiting for something to happen.