Parts for the battery box are turning up, looked at pre built but want it made for my requirements so starting with a blank canvas. The power to charge it from the Jeep will hopefully come in through one of the ribs on the front of the trailer, or a fake short rib, and then to a flush mount anderson plug.
This will give me a total of 170AH of power when in camp, or 105AH in the trailer and 66AH in the Jeep (all isolated from the starting battery) with 120W of Solar whilst in camp of charging from the Jeep on the road.
Cheers
Steve