My 2 Trojans went dead this spring - they were original so were at least 5 years old. I replaced them with 2 Energizer golf cart batteries from Sams at $71 each. I haven't dry camped yet so don't know how well they last, but I'd expect a couple of days at least. With not running the heater, I'd epxect you'd get 3 or 4 in the application you noted. We camp mostly with hookups so didn't see the need to spend lots of $$$. And if you have a generator that should take care of any charging issues.
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