Leak under shower

It definitely looks like it’s just that hole around the water pipe that runs to the toilet! It comes through the floor with at least 1/4” around in wide open for water to flow through. There has to have been a gasket at some time. With a access door from outside and a removable panel inside, I can see pretty clear under the shower and it’s not leaking around there. It leaks along a seem after it passes through the hole above, and out of the trailer. I’ll have to figure out a way to seal is up, or just don’t use the shower. So far no problems with the toilet, and the shower runs off the sink connection and doesn’t have any separate plumbing. Fortunately I can see all the plumbing for the sink and it looks good. Still need to fill the propane and check all those connections, but so far so good!