Depends upon whether you are using J pipes or 4 into 4's. With 4 into 4's, you have to install the side pipes and then determine (1) the "levelness" of the pipes, (2) the distance from the ground on each side, and (3) the relationship of the pipe to the frame, ie are they parallel. There is a different adjustment method for each problem. After all those parameters are set, then you can install the hangers. You can't adjust by moving the hanger placement. With the J pipes, the whole setup is much different, and I'll let someone who has used them tell you how to do it. If you want more info on the 4 into 4 setup, I'll be happy to give you a step-by-step.