I have a Japanese 24V HJ61. In order to haul a standard Uhaul trailer i need to wire a 12V flat 4 from my existing 24V Japanese Round 7 Pin. This is the wiring diagram I've come up with. Anyone see any issues? (a few years ago I installed a 12V Battery Bank in the rear compartment to power my head unit and some under seat lighting via a REDARC BCDC 1225D.)