We do not know how these are officially called, but if were the godfathers of this invention, it would be called — Chain skies.
It is winter out there, and you have to watch out and be careful and prepared for all kinds of situations! For those of you living north, things can get messy, you have probably been witnesses to dozens of snow stuck trucks!
The video you will see will teach you how to ride your truck always and everywhere, regardless the conditions! This especially helps when your roads turn in to 7 feet high snow where otherwise, you become truckless!