Cookie's Chuck Wagon is a vehicle from the surface world that is driven specifically by Cookie Farnsworth. It also doubles as his kitchen whenever he ventures on an expedition.
It appears Cookie operates the chuck wagon with an exterior motor. This is presumably done to endure the vehicle functions properly since the tires look to be made of wood as opposed rubber. He has the exterior motor tethered, imagining it to be horses or donkies that pull his wagon. For reasons yet to be known, whether others wish to or not, he cracks a whip whenever he wants to speed up.
The wagon stocks all of his cooking provisions. It is apparent that Cookie dislikes when others try to reorganize his supplies, adding what he considers to be non-essentials such as lettuce.