Hi, I see no responses to your posting yet. Did you try using the correct shower hose washer and remove the teflon tape and old washer that was too big in diameter? I am not familiar with your coach but on my ACE the OEM shower mixing valve uses a cheap plastic shower hose connection.....and it's a break/crack waiting to happen IMO. The worst part would come when trying to replace the mixing valve as most coaches don't have easy access to the shower valves/pex connections in the wall. Some folks have had to make their own valve access via the bedroom wall and then cover up and refinish (depending on your floor plan etc).
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