need to do like me and just go from the truck batteries direct to the camper batteries thru the 7 pin you added on the truck. Only it's better to go thru a continious heavy duty relay with the trigger wire switched in the cab. this way if the camper batts are deeply discharged you won't hammer the alternator while using the intake heater or the seat heaters at the same time. Give them a chance to go, replenish the truck batts and then switch on the charge wire to the camper. The second gen alternator is just a hair shy of giving enough amps so it's best to control it and alternate the load put on it.
Just one burned diode in the alternator builds additional A/C ripple thru the system which is bad for the ECM and the PCM circuits so you want to keep the AC ripple below .05 that will tell you if your alt is still good. It can still chrge with a burned diode but the A/C noise hurts the electronics over time.
