Originally Posted by FW28z
Mine is that way, but the shower is above the black water tank, so I am not sure if there is any plywood there or not or just resting on the tank.
I would hate to think that your shower pan is resting on top of your black tank without support. Is it worth the trouble for you to remove the shower walls and floor pan. I hope you are able to find a solution. Maybe a call to Thor may shed some light on a solution.