Our 12/12-18 Victron DC-DC charger outputs around 25A and the draw on the truck side is pushing 30A.
I ran a dedicated 4 AWG circuit since it's approximately 40 ft in length and I was afraid that there could be times when the alternator output dropped such that the input voltage would be below the minimum allowable with the factory 12 AWG charge wire. Victron recommends a minimum of 16 sqmm wire cross sectional area (approx. 5 AWG) for a 32 ft circuit length at 12V.
I used Anderson connectors for between the truck and trailer.
