Something along the lines of a bladder might do the trick but you still have the waste water issue to contend with, as Skip pointed out.
In my rigs case, the fresh water tank is behind the axle and waste tanks (3) are forward of the axles so my pin weight is lighter when I arrive vs when i leave.
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2012 Dodge C3500 DRW 4x4 Long Box, WeatherGuard 90 Gal transfer tank, B&W Companion Hitch
2012 Keystone Montana 3100RL, 520W Solar, 460AH batteries, Morningstar MPPT 45 CC, Bogart 2030RV monitor.
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