This is my 1st camper and I have learned a lot from this forum so far... thanks!
I have a black tank drip from either the threaded pipe going into the tank or possibly the flange on the tank. I pulled the toilet first (need to change the seal) and I noticed that the tank was bolted to the top of the tank with no flange. This method of mounting allows the toilet and tank to flex a lot. I am worried about this cracking the tank. Is there a way to add strength to tank?
You can extend the pipe that is going into the black tank. Mount a piece of 3/4" plywood (with a hole for the pipe) to the floor and screw the toilet flange down.