We took delivery in early March. They stated that the wet system was already tested for leaks when the trailer arrived. I asked them if they could put 20 gallons of water in the fresh tank and let the on board pump pressurize the system. They did and the pump pressurized and stopped running. The pump is your best leak detector. Make sure it stays pressurized for 3 or 4 minutes without cycling and you should be good to go. As far as electrical, just turn on anything/everything you can.
2012 Eagle 320 RLDS
2012 Ford F-250 Crew Cab FX4, 6.7l PSD
3.55 E-locker, Timbrens