Thanks for your input!
Your calculations are pretty close to mine,
12 Volt Equipment and Draw;
Water pump-60 Watts, .5 hrs per day=2.5 Amp hrs
1 Lamp, 50 Watt, .5 hrs per day= 2.08 Amp hrs
2 lamps (total of) 40 watts, .5 hrs per day= 1.65 Amp hrs
2 Fans, 2.16 Watts (each) 4.32 Watts, 3 hrs per day = 1.6 Amp hrs
LCD TV, 120 Watts, x 2.5 hrs per day = 25 Amp hrs
DVD player, 20 Watts x 2.5 hrs per day= 4 Amp hrs.
Power consumption including a good movie each day is 36.83 Amp hours.
Total capacity is 52.5 Amp hours.
If I watched just one movie, I could squeeze a 3 day weekend out of a full charge.
If I kept my nose out of the television altogether, I could get 6 days out of a full charge.
Shame there isn't more room for extra batteries...but that's how teadrops work...
I do have both the TV. and DVD. player switched, to avoid any standby discharge.
I'm considering a (very) small generator for recharging the batteries, and or running the high draw items on extended outback type trips, along with recharging from the tow vehicle.
By the way, are you from the Northwest?