The there are two power systems. The tow system (lights and brakes) is powered by the jeep. The house system ( everything else) is powered by a pair of 12V deep cycle batteries. The two systems are for the most part isolated, but the onboard charger can take 12V from the jeep to charge the batts at a much slower rate than if it were connected to shore power.
The water system consists of a 25 gallon tank w/ 12V pump. It will also include a propane fired water heater (hopefully before it gets cold).
Can you show me your power setup? (Pictures and what you did exactly?)
Red Jeep Club #345 2006 TJ Sport - Build 2004 KJ Limited 2013 Off-Road Trailer - Build
Long term bump/update. I added a tekonsha p3 brake controller to my TJ over the weekend and dialed in the brakes. When I built the trailer I used a 3500lb axle with Dexter spindles/brakes, but have not used them until now. My limited testing so far leaves me very happy with the results. I wanted the controller to be very visible/ accessible when in use but removable when I don't need it, so decided to mount it above the dash via a GoPro suction cup mount. It is ugly, but strong and can be installed or removed completely very quickly.