Why not add an accumulator tank to the pump? Added one to our trailer to "smooth out" the flow and stop short cycling of the pump when drawing small amounts of water like rinsing a toothbrush. Most hold about 1 liter so if you turn on the pump before departure and pressurize the system and then shut the pump off you should have enough water for that emergency flush.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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