I'm assuming that your RV is still under warranty. You will need to take it back to the dealer and insist that they reconfigure or replace the shower base so that the water drains properly.
It's basically an installation defect that can only be remedied by removing the existing shower floor and installing one that drains when your RV is level. There are no quick fixes. If you run into resistance at the dealership, contact Winnebago directly. Best of luck.
Jack
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2004 Winnebago Brave 34D with the usual add-ons
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