Always do a test camp at home at the beginning of the season, before going camping for real. Use the water, use the hot water, use the heater, use the AC, use the battery, use the water pump, use the toilet, check the drains for leaks, and most importantly, as we discovered last season, check that your battery holds a charge. We boondock, and ended up having to make a special 1.5 hour drive to an RV place that had deep-cycle batteries. A waste of several hours that could have been spent relaxing.
TV: 2013 Ram 2500 4x4 mega cab w/6.7l Cummins
Trailer: 2013 Palomino Puma 27SBU