I just finished a week of hunting camp in my Laredo. Temps were mid 50's days and mid to low 20's nights. I didn't winterize, but kept the furnace on its lowest setting at night. It stayed about 55 inside and I had (edit) NO freeze problems.
Your results may vary, of course.
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2010 Laredo 245RL
2007 Dodge Ram 2500 CTD 4x4
Andersen Ultimate Gooseneck mount
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