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We travel and camp during all seasons, including snow and ice. If you intend to do the same, slide awnings are a must. Otherwise you will experience an ice dam or snow blockage inhibiting the slide to come home.
The first morning with slide awnings after snow or ice and closing up to get on the road will be a happy moment when the accumulation simply rolls off the end of the awning...
You may still need to brush out or if warm enough wash out any accumulation beneath the awning if there was any drifting.