Look at a marine fuel inlet for a remote tank on a boat. You can find them at any boat dealer or online. Get the fill port and a vent, and the length of hose to reach.
2021 Ram Limited, 3500, Crew Cab, 1075FTPD of Torque!, Max Tow, Long bed, 4 x 4, Dually,
2006 40' Landmark Mt. Rushmore