I like it soft, fluffy and a big wad.
TP along with stuff gets flushed down a 3" line and then dumped out of a 3" line.
Water & gravity carries the whole stuff down roughly a 3 foot drop into the tank.
That is way more water then what carries the stuff down a 30-50 foot residential sloped line.
Then when tank is full...water weight, gravity and sudden rush of the liquids carries the stuff down a 4-5 foot dump line.
RVs are not complicated........K.I.S.S.
Use what TP YOU like. I do! And have NEVER had a problem with TP, Poop Pyramid, Clogged Pipes or Odor.