It might not be a bad idea to try it out now BEFORE you need it, nothing sucks worse than finding out it doesn't work when you do need it. If the truck has manual hubs, it is also a good idea to periodically engage them and drive a few miles.
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Believe nothing, no matter where you read it or who has said it, not even if I have said it, unless it agrees with your own reason and your own common sense.-
Siddhartha Gautama
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