There is a vertical flange on the tub that extends up behind the shower wall. It "should not leak" up and over that flange. There are several (I see two in your photo) plastic button fasteners that hold the shower wall to the trailer studding to prevent the center of the shower wall from bulging. Sometimes, there's just enough gap under the head of those plastic buttons to allow water to leak behind the shower wall and down the stud, ending up behind the tub and then into the front passthrough or behind that in the basement....
You might be able to pull those plastic buttons, add a little sealant around the shaft so it covers the center of the button and seals it against leakage.
With the "it only leaks when the shower head is pointed at the rear wall" comment you made, I'd look further up the wall rather than at the tub/wall junction.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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