I have had two tent trailers (still own one), and it's touch and go running a furnace all weekend if it's cold out and you're not being mindful of it. I wish there was an option to turn the fan off on the furnaces and just let them radiate heat in case the battery dies. Nothing worse than waking up at 2 a.m. to the sound of your battery alarm going off on your trailer, followed by no heat.
Keep it pretty cool at night (~10-13 degrees) and that'll help extend the life a lot. I also installed a hand pump on my sink so I'm not using battery power to draw down the battery with the electric pump.
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