Are you sure? My lines, hot and cold, went up the driver wall diagonally, over the rear doors and down the passenger wall.
Incidentally, I also found two new, never opened line drains so far under the water heater I couldn't have turned them if I knew they were there.
Pump is definitely inside, as is the fresh water tank. Under the couch/bed. The lines are inside the walls, but on the interior side of the insulation.
Btw re pressure, I found a cheapo plastic fitting with schrader valve and it says "max 50psi" which is probably plenty anyway. I have a huge tank on my compressor, I am going to run it up to 50psi and then shut it off, and then use it from there to blow out.
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