It sounds like you may have a bockage of Tissue in the pipe that goes from the john to the tank. There is a slight bend in the pipe but I have seen tissue pile up there. Since you have been boon docking and not using enough water to flush that may have happened. you might try the garden hose down the john trick...be verrrryyy careful.
On Edit..If you dropped the underbelly panels and there is NO foul smelly stuff there.. The tank is NOT leaking. Which makes the tissue build up in the down pipe the prime suspect.
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