Placement of Reese standard bed rails?

I think this link will give you what you are looking for. The only thing I could not find was the distance between the rails.

They have a phone number for help and I would think they would give you the dimensions you need.

If you have your hitch it would be real easy and probably a tad better.

http://www.reeseprod.com/content/downloads/installation/N30035.pdf