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The ability to charge them in colder temps...but I'm figuring they'd go 3 days without us rationing, so it'd be pretty easy to wait til the sun puts a little heat on the battery box to get them above freezing.
Mostly I'm afraid of something stupid...The trailer's at home, on the street, hooked to shore power, and the charger decides to add power to them (maybe they're down a little from when they were used last.) Low temp protection is the only major feature I see between a $400 battery and a $1000 one.
We used the trailer over Xmas one year where temps were in the 20's...based on the volume of Propane we went through, it's not a good deep winter trailer.
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