I use a Hopkins Multi TowTrailer connector adapter 7 pin 12 volt to plug a RV pump into the back of the truck. It pumps my 2 collapsible water bladders into the 5er gravity feed. I just installed a 12 volt cigarette plug onto the pump wiring. Etrailer has them. I bought mine in Canada via princess Auto a few years back. I don’t think they carry them anymore. Works great and no lifting....I lied. Just checked and Princess auto does have them
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