The brackets on the ends of the extension arms (ends toward the middle of the unit) will bolt to the body at the bumper bracket mounting holes in the front and in the frame cross brace in the rear. Then I will use my engine hoist to lift the end frames high enough so that it can pivot all the way around and still clear the extension bar across the bottom. The extension bar is a telescoping set of tubing that bolts into both end frames to keep the assembly rigid once the body is mounted. The whole assembly can pivot around the piece of round tubing that joins the two uprights at the top. It might not be too easy to follow my description, but if you search on this forum for rotisserie, you will find several member's cars mounted on one and it might make more sense than my description. Welcome to FABO! L8r