I have seen two differfences.. NOTE the only "RV Toilet paper" I've bought was indeed very pricy, abour 100,000 dollars. but it came wrapped in a brand new class A motor home :) (Might explain the cost) and it was a good grade of sandpaper.
Scotts works well.... For political reasons (All I'll say about it) I do not suggest Angel Soft, I'm currently using Prince and Spring.. just got some more in fact...
Now Prince and Spring.. it's the house brand for boxed.com (That's the URL) Think Sam's club type packaging (like 36 rolls as I recall) and pricing but without the hike to sam's club. (nearest one is about 30 miles where I am) as BOXED will UPS it to either your house or the park office.
I also get my Cheerios from them. and some other stuff.. Free shipping if order hits I think 75 Bucks, usually 2-3 days BIG boxes My last order included
TP. Ketchup, Coffee (Folgers) they also carry some others) Campbell's soup. bread crumbs. BBQ Sauce (Sweet Baby Ray's I have a friend who told me it was his favorite.. I told him That made sense, his name is Ray, he'd never put the two together before). and laundry soap. Two boxes.. Only one fit in my car (the other was tied into the trunk) but they both fit through the RV's door.