Abstract: The rack for mounting to a vehicle includes horizontal upper and lower cross members. A pair of downwardly disposed mounting posts are mounted on opposite ends of the upper cross member. Where the truck is a pickup truck having a cargo box, the posts fit downwardly into the post holes in the side walls of the pickup truck box. At least one wheel clamp assembly is mounted, at it's an upper end, to the upper cross member and mounted at its lower end to the lower cross member. Each wheel clamp assembly includes first and second opposed facing parallel vertical clamp members defining a wheel receiving space therebetween sized for snug mating on either side of a wheel disposed between the clamp members and the cross members. The clamp members each have laterally aligned apertures therethrough.