All models include Swagman's unique Kraton "gripper" cradle surface to hold the bikes securely in place. Generous spacing between the large "v" cradles allows for easy loading and ample distance separating the bikes during transportation.The Swagman 4-bike Rack is the strongest hitch rack in the industry. Tested for 100,000 miles of loaded use, as are all Swagman Hitch Racks, this carrier is the product to get you there and back! Built of cold rolled steel and sporting the thickest powder coat in the industry this rac will provide years and years of solid performance. Upgrade with a set of locking knobs and a locking hitch pin for added security!