From your description it sounds like it will only be around freezing and not for any length of time like days. I wouldn;t worry about it. keep the temps higher than 40 so the underbelly stays warm. If you have one full tank it should certianly last you thru one night at a comfortable temp.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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