Nope, it really does not seem to matter. You can Google "RV toilet paper", and you will find that what matters is whether the TP breaks down well, given a little time in the water. The simple test is to get two canning jars, fill both with water, add a loose wad of TP to each, put the lids on the jars, give them a short shake. Set them down, and wait a while. Anything that breaks down is OK - anything that stays in a wad is not.
See, for example, this discussion on RV101.
http://www.examiner.com/article/rv-1...v-toilet-paper
Most, but not quite all, household TP works perfectly well. no need to pay through the nose for "special" stuff.
Bill