Do you really have a need to open them? I wouldn't unless absolutely necessary. Problem is you could have snow build up or snow/ice that has built up and may break something as you go to extend it.
Also, and probably should have asked this first...how cold are we talking?
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2016 Chevy Silverado 2500 Duramax
2016 Rockwood 8289WS, Diamond Pkg.
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