OK, after an exhaustive 3 month test in our 5th wheel using one roll each of every kind of TP we could find; and watching through the clear elbow on every tank dump; the results are in.
While dry camping with routine black tank dumps to a "blue boy" (every 4 days or so) with no opportunity to use turboflush due to I have to haul that water a quarter of a mile and haul the black water almost the same distance to the dump station ....
NO DIFFERENCE in TP (IN THE TANK). All TP used exited just fine when dumped regularly. BIG difference before it GETS in the tank (if you get my drift). We are going for comfort now.
Solids are the major issue; not the paper. Paper not sticky; solids are.
Since water usage is minimized and turboflush is not used "much", Calgon Liquid Water SOFTENER (not Calgon Laundry soap) is critical. After dumping, a cup of Liquid Calgon Softener and a few squirts of dish wash soap or a quarter cup of laundry soap lets most of the solids leave on the next dump.
Now having said that; it really does depend on how your campground manages THEIR septic system. If they use a city sewer, no worries. If they use a septic system or sand mound then they most likely would appreciate you using septic safe TP.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW