Maintain your equipment and you shouldn't have a problem.
A d12 uses about .7-.8 gallons per hour of idling. But that isn't the whole story, you're wearing out the engine and putting a lot of crap into the oil by idling so much.
I regularly use the TV/computer for 2-3 hours before going to bed. Never had a problem. Even in winter.
Make sure you have high quality batteries. High CCA batteries are NOT the answer. These units have thinner plates, and do not like to be cycled. You will have very shortened battery life if you use these units.
I'd suggest using a CAT battery, 800 CCA, both deep cycle and starting battery. Very inexpensive, $80 around here.
Or, if you want to go high end, get an AGM(absorbed glass mat) battery. Optima and Odyssey are the most popular. The odysseys are a little more $, but they have HUGE CCA, lots of reserve capacity, and should last up to 8-10 years. These are $200+ each.
Also, make sure your charging system is in good order. Make sure the voltage delivery to the batteries is very good, and you have clean connections everywhere. You'll save your starter by doing this as well. Low volts are NOT good for starters.
As far as air conditioning goes, I'm in the same boat as you. My dad uses a regular apartment a/c unit running off his inverter, but this can be very hard on batteries. They're not meant to be drained that much, AC's take a lot of power. The best would be a really efficient unit, but that's more $.
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