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i know they go on the rear wheels, and i'm gonna fool around with them when i pick them up, make sure i can put them on easily enough. used them once YEARS ago, before i was driving.
Drag chain is what they call the chains on a trailer. Used for braking purposes. Otherwise if you had to jam the brakes, your trailer brakes would lock, and your trailer jacknife causing a nasty accident.
Good idea to prefit your chains and become intimate with them. That way when you are putting them on the the middle of the night in a blizzard it will be that much easier.