The radius arm pivots are braced with a simple piece of tubing that spans the distance and doubles as a tranny crossmember. Check out the brake line routing. Hard line runs down the frame to a short section of flex line, then more hard line runs forward along the radius arms, and finally to another section of flex line connecting to the caliper. This routing takes more work than just running long flex lines directly between the frame and calipers, but it does a much better job of keeping the brake lines away from harm. The JD J-beams produce 20 inches of desert-ready suspension travel.