[anijet]

I'm not sure what information you are looking for but here is what I can offer. The bed rails and hitch can be reused. I recommend you use the custom mounting brackets made for the '11-'12 GM 3500 to secure the rails to the truck frame. I installed the Curt brand myself, they fit right and are plenty strong. You will need to raise the hitch and/or lower the pin box to maintain clearance on the new truck compared to the '01 since the bed sides are about 1.5 inches higher, IIRC. This may also require raising the 5th wheel on it's suspension. On my '07 Suite there are three holes in the spring hangers and I needed to use the bottom holes to lift the trailer as high as I could without major modifications. I also loaned my truck to BellTech to lower the rear end. They came up with shackles that lowered it 1 inch measured at the rear axle. These are now available to the public. Even though it took some doing in the end I am very happy with the outcome.