If your multi tank setup is similar to what our Challenger was it is either 2 permanent pumps or one portable that you switch back and forth. The was no way on the Challenger to connect the two grey tanks into one dump valve because the rear wheel well was between the two tanks.
My current rig uses a Sanicon Turbo and it is a good system. As soon as my extension hose comes in on Thursday my tub of stinky slinky is gone.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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