Hi ! Welcome to IRV2! We're sure glad you joined the gang!
We've been using the Charmin Ultra Soft for years without any problems. We do use Happy Camper tank treatment, which pretty much dissolves everything, and I use the tank flusher after dumping to thoroughly clean the tank!
Good luck, happy trails, and God bless!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD