If it's backing up into the shower pan your holding tank must be full.
You should check your drain valve. It probably is broken so that when you pull the rod to drain the slide valve isn't opening.
Or something is clogging the drain exit.
Perhaps someone has been dropping "wet naps" into the toilet?

Emery Stora
77 Kingsley
Frederick, CO

> On Jan 21, 2018, at 7:39 AM, Johnny Bridges via Gmclist wrote:
>
> What's the chance one of the tanks isn't draining properly?
>
> --johnny
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
>
>
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