We are not fans of RV paper and never buy it. We use Scotts singly ply, just like at home. But having said that, I wouldn't rush to judgement given the test results in the OP linked above, which have little application to an RV holding tank.
They pinned TP to the ground and waited for almost a month with only a trace of rain, and then had a more rainy day with 1.5 - 3 inches of rain. This might be a fine test for backpackers who do like bears and do it in the woods. But in my opinion it is pretty meaningless to RVers, who have a holding tank that has constant water and liquid in it and the TP sits in that liquid.
This is example of people taking an experiment and applying it to a completely different situation than intended. This is really the worst kind of application of science, because it has the appearance of credibility, but in reality has almost none.
Again, we don't use RV TP because I believe it is a waste of money. And maybe, as some have said, there are other experiments that prove it, but the experiment posted in the original post certainly doesn't. The experiment in the second post, even though appearing to be "less scientific" probably has more credibility.