I used connections like Ski Pro ^. I installed a diode isolator under the hood, and ran battery cable gauge wires to through bulkhead posts high in the front of the box. I made shortie cables with the connector from the bulkhead fittings to the batteries in the camper. I can quick disconnect without tools when unloading the camper. I can remove the truck half of the cables from the box lugs to store it out of the way when hauling stuff with the truck.
14.6v measured at the batteries with the engine running.
I disconnect the little blue charging wire in the camper cord end to the truck, but leave it alone on the truck end so it works for my other trailers that have emergency brake batteries.
Any connector mentioned above that is rated for the alternator amperage will work.
My new campers batteries are at the total opposite end of the camper
