If your pressure is sufficient while it is actually working, As Dagst1 mentioned above, make sure the tank you're connected to is vented. Also, The lower the level gets in the tank, obviously the lower your pressure will become.
I'm wondering if turning on your 12v pump would help, or does that draw directly from the fresh water tank?
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2010 sunset trail ST26RK, 2012 Nissan Titan SV crew cab, equalizer hitch / Pine Grove, Pa
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