I'm in my 3rd Jayco and never had a tank issue. My first two campers (1 hybrid & 1 TT) both had Tornado systems installed. My current has a factory flush system. I flush at every dumping (no pun intended) and then fill it all or part ways with water and dump until thee water coming out is clean, using a clear section between the camper and the hose. I may skip a full rinse if there are lines at the dump station, but that's the exception. Flush systems are great, plus I don't have to deal with smell issues in the tank.
2012 Jayco 32TSBH
2004 Ford Excursion
ProPride 3P / Tru Control brake controller
Roadmaster Active Suspension