Locate the anti-siphon valve under your bathroom vanity. The PEX line likely goes directly down to the location of the spray head in the black tank. There may be a short horizontal run of PEX, but if your anti-siphon valve is 56" from the interior wall on the road side, then the spray head "should be 56" measured from the interior wall at the tank level.
I've seen most spray heads mounted to the side of the tank "under the floor, just above the coroplast" and I've seen some that are mounted above the floor, in the basement of the trailer, near the upper edge of the black tank. So, if you can't find it "on the tank above the coroplast" then take the passthrough compartment walls off (there are screws to remove them) and see if the top of the black tank is visible from "above the floor"....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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