If your rig is a newer series and has a multistage converter such as a Progressive Dynamics unit with the Charge Wizard circuitry, leaving it plugged in should work fine, as a fully charged battery will not freeze, and these modern converters maintain the battery instead of just keeping a trickle charge on them.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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