Yea the track bar is the hardest part to package in the 3 link. As far as the 4 link goes, its the same amount of heims as a 3 link and the top links are easier to package. You'll just have to make a truss or just make some tall brackets for the uppers and brace them in really well. Either of which I doubt will be that bad for you. Like Chris said, you can always triangulate the uppers outside of the frame rails to get the most out of them.