I dont need to plug in my laptop in my tent. Its just kinda cool to post up the days events at the end of the day before turning out the light, or watch a dvd. But my laptop runs about 3 hrs on battery. I'm going to have to figure out how to do my air mattress though. My pump is 120 volt and the mattress is WAY too big to fit through the door once inflated. Takes a lot of air to fill a queen size double height air mattress.
Depending on where and how I set up my tent you may be able to use my extension cords. Gonna bring about 150-200'. This is why I said site D was better.