closed tank valve 25-35 gallons of water with dishwasher soap in the tank , dump it as soon as you get in the park. 1/2 full tank . every flush with paper needs to be at a min 1/2 full bowl of water . Don't use house type toilet paper , it doesn't break down fast enough in water. I like to dump my tanks when they get over half full , then connect the tank flush for 5 mins. I am sure you have heard and practiced these methods but they all help in avoiding a chit pile of problems.
Mark & Melissa
2015 Redwood RL38 , Kodiak disk brakes , 17.5" tires , 8K Morryde IS