PFC Lug Nut is a 1942 Army truck. His best friend is Smitty, a private in the Army. Lug Nut has the ability to talk with Smitty and also has mechanical telepathy, which he uses to talk to other trucks, even those far away.

One day Lug Nut learns that two other trucks, Hub and Bumper, are lost in the woods, along with a few mechanics, and now the whole group is stuck in the snow. Without orders, Smitty and his truck set out into the woods so they can save their friends. On the way, they even help a mother cow from a muddy pond, making sure that she and her calf are safe.

Lug Nut is willing to risk it all to protect those that he loves, so he and Smitty stop at nothing to rescue their friends. If they can pull this off, they'll save lives—and might even get promoted!