You are then saying that you have no relationship with the ground because if my winch is pulling you up regardless if your traction than you are basically saying that I could be winching you up the hill even if your truck was suspended or hanging off the side of a cliff. You are negating the relationship your truck has with the surface completely.

In the treadmill scenario the relative relationship beteen the surface (the belt) and you (your feet) is the most important factor because the belt is designed to match the speed to maintain the relationship. If you were to be yanked off the treadmill by an external force and your feet LEFT the surface of the treadmill then and only then could you be removed from it.