I have used the snow socks on my Thor Vegas 24.1 on a steep downhill that was snowy coming down from Anthony Lakes in Baker City, OR. It was super sketchy. It did help with slowing down (along w/ using the engine brake). Took me about an hour to descent 5000 ft and 7 miles. At low speed they do work well, you are just limited to 15-20 mph or so. They are emergency use only to get you out of a jamb or off a ski mountain resort. I would not plan a trip where i would need these on a highway in snow or ice. Its really dang dangerous to drive in the snow/ice with the RV, i avoid it as much as possible.
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