Westin Signature series 3" stainless tubing. I paid around 250 for mine, real truck's service is amazing and swift shipping to boot. i would recommend them any time you need an accesory. They are having massive christmas sales right now to.
The first mounts right behind the wheel well directly to the frame.
The second mounts onto the body bolt right above the first bracket for more support.
The last Bracket mounts in front of the back wheel well directly to the frame.
They are incredibly stable and can support a good amount of weight.