Not sure about your layout but on my Challenger the shower drain is accessed from a storage compartment below the shower. On the ceiling of the storage compartment there is a small (about 6 x 6) plate that is unscrewed to access the drain. This access plate is shown on the waste water diagram for my coach.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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