We are happy with our two Trojan golf cart battery upgrade. Since making the switch, we have dry camped three times. The last time, at Timothy Lake, near Mt Hood, we dry camped three days and two nights and only used 1/3 of our battery with the following conservation measures:
1). Extended the jacks and slides while hooked to the PU with the engine running
2). Limited use of incandescent lights; we have installed LEDs in kitchen, bathroom and reading locations. We also have an LED lantern. We are "early to bed, early to rise" so were not inside much, after dark, except to read a bit and sleep.
3). Did not unnecessarily use the ceiling vent and stove fans; ran the water pump conservatively, including 2 "military" showers.
We were outside during most of the day and did not need to use the furnace at all. I estimate we could easily dry camp, under these conditions, for a week.
Before converting to the golf cart batteries, we could barely dry camp for this length of time.