I have the 28BHBE (the Jay Flight cousin to your trailer) and mine is under the sink. Pretty easy to access. If it is back by the water heater, you can access that from the bottom bunk. Take the mattress out, and there should be a flip-up panel for access to the WH (look for a finger hole, this is how you'll access your winterizing bypass valves), if the pump is back there, that's how you'll get to it.
I doubt it's back under the bunk though, because it should be as close to the fresh water tanks as possible, which should be just fore of the front axle on the curb-side of the unit.
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-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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