Road shower on a go fast?

How is the shower attached to the rack? I want to do the exact installation on my Prinsu rack.
Thanks

Will try to get some other pictures today but I simply used a spacer washer under the road shower to allow the edges of it to still sit on the edge of the wrack flush and be supported by that part of the rack as well.
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What about strapping to the camper frame inside along the top of the side door frame section? I’m planning a 6” PVC pressurized tank 50” long which should be 50 lbs dynamic when full (water) and 10-15 lbs static (PVC pipe and fittings). Same longitudinal dynamic load as if it was strapped to beef bars on the roof…just lower center of gravity.

Looking to install my road shower horizontally on the Martin OR rack, how did you guys do it?