I did the same but got tired of all the bugs flying in with the doors wide open. Ditched the rear shower wand and installed an outlet on the side of my vehicle. I just use a pop up bathroom enclosure and I don't have to waste water waiting for the hot water to get to the rear wand anymore.
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2006 Ford 6.0PSD EB-50/E-PH SMB 4X4 Rock Crawler Trailer