This thread has been very enlightening. We have a 2017 Heartland Oakmont 400FL out on it's maiden trip, far, far from home. (we are currently in Maryland; home is near Atlanta) After a shower, I discovered a trail of water from underneath the shower out the bathroom door and into the hallway. I thought the leak was from around the shower door frame, and put a bead of clear silicone around the frame. However; had the same water leakage the next morning.
I unscrewed the bottom access panel and saw water leaking from above the shower pan, but when I unscrewed the access panel below the faucet, all was dry. So I am at a loss. I called the CW dealer where I bought the unit and made an appointment to drop off the 5ver so they can fix the issue. I will be sure to tell them to hook it up to a water source as a test before I take possession.
This forum is a great resource! I'll post again with the results from CW.