If a used truck rack is adjustable or universal, it fits on most trucks. However, not all truck racks are adjustable, so they don't all fit correctly on all trucks.
Used truck racks are available online from Amazon.com and eBay, as of 2015. Both retailers have a number of brands available, including TracRac, Titan and Thule. When shopping for a used truck rack, the buyer must refine search results to only list used items. It is also possible to refine results by brand, location and reviews. On eBay, it is also possible to refine search results by the make and model of the truck, which ensures the truck rack fits.