I'd be concerned about leaving anything running in the unit while you're gone, from A/C to rain-sensing vents. Anything that draws electricity, unattended for long periods of time, could malfunction, short-circuit, and you've got ultra-serious problems on your hands. I'd go with a whole-unit cover and leave windows open slightly to allow heated, interior air to vent.
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2012 Silverado HD3500, Crew Cab, Long Bed, Dually
2013 Infinity 3850RL
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