Oaklevel, the truth is its all about water and not the TP. Like you we have a septic system and only use regular TP, in the house and in every camper we've owned. Clogging hasn't been an issue in the campers and our septic service moved us to a 2-year cleanout schedule because every year was too much.
For campers the key is to always fill the tank up with 3-5 gallons of water after adding the blue stuff (or whatever additive you use). Figure 6-10 full toilet bowls. Then, any time #2 occurs always fill the bowl up half-way. If necessary flush in the middle of use and refill the bowl again.
Water, water, water.
2008 FR Salem 26TBUD
2010 FR R-Pod 171 (2009-2015)
2010 Chevy Suburban
Honda EU3000is inverter-generator