The trailer came with a single 100AH Remco AGM battery which was good for a few days powering the lights and fridge, but I can go for longer so I upgraded to dual Remco 100ah batteries, a Victon Battery Monitor, CTek Dual 250S charger and a Jaycar Pure Sine Wave Inverter - which unfortunatly never gets used.. I might give it the flick. I also have a 120w folding solar panel kit (ebay) and I can now run my CF40 fridge, all my lights, phone charges etc for almost indefinate periods of time - as long as I get mostly sunny days :-)
Ive doubled the number of cig lighter sockets at the rear of the trailer and added an anderson plug for the fridge. Now I can charge everyones phone, run the fridge and some lights all at the same time.
On the side of the front box I installed the Victron monitor and a solar panel input socket (Hella)