I'm always worried that lifting up my water gerry can to add water to my fresh water tank will cause me back problems during a camping trip. The mod will pump water from the cans into the tank.

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Typically I add water to the tank by holding up this 5 gallon container. Yes it look easy when it it empty but no so when it is full with water.
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I though about using a drill pump but this pump was too slow.
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So the alternative was this 12 volt pump. Some of the parts are: 12 volt pump, PVC pipe, garden hose and fittings.
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I found a plastic box at Radio shack that I have mounded the pump inside. This also shows the other fitting I'm using.
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This is the pump mounted under the PUP with the cover off.
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The pump inside the project box with the top on.
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Two switches. The one on the left is for the water transfer pump. The one on the right is for the fridge fan.
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I tapped into the 12 volt wires that are in the fridge compartment...
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With the pump, two fridge fans, two switches, and two fuses the wiring got more complicated than I had thought. I ended up wiring everything onto the barrier strip and placed in this project box. NOTE THERE IS A BREAK IN THE JUMPER STRIP BETWEEN THE POSITIVE AND NEGATIVE WIRES.
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Here is the project box with its cover.
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The transfer pump in action.
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Courtesy of He Ruide [Image Can Not Be Found]