The Racer Rig is a Hot Wheels casting which debuted in the 1971Heavyweights. 'The Heavyweights' was a series of futuristic trucks designed by Ira Gilford.
The Racer Rig was only produced in two colors; Enamel White and Spectraflame Red. It could be found with either a white or dark brown interior and was packaged with a plastic 'Collectors Button'. It has a opening tool-box and a slide-out ramp onto the trailer.
The front cab is known to have issues with a metal fatigue called 'Crumbling' where the body or chassis develops cracks and literally crumbles into pieces.