I found it. There's a wet spot dead center of the shower pan and flows toward the front of the coach, over the wheel housing and out of the rig. Shower faucet faces the rear and all is bone dry. Ruling it out for now.
There's heater duct hose running between 2-2x4 supports that has to be removed - which reminds me. I was in there a few mornings ago when I took a step and heard a loud crack. Looked around and didn't see anything, until now.
There's a tee that joins the kitchen sink to the tub drain but that appears dry. Going to rip everything out, if I can, run the shower and see if I can identify the source. I look for low point drains once everything is out of the way.
Stand back. I'm going in - as soon as I finish my coffee
Update: I got the hose out of the way. There are lines running along the outside wall and over the wheel well (absolute genius in cold weather) but the leak seems to be coming from the high point on the well and puddling in the center of the wheel well until it overflows and runs toward the front.
It's in such n awkward place, things seem to point to ripping the shower out.
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