This is a 2007 29 max bumper pull. New and never registered till this year. When purchased it came with 3 10' sections of L rail but no mounting hardware or instructions where to mount rails. Any help would be helpful.

Well, it has been about 3 years since I worked on that unit, but if I remember right, 1 goes down the middle, the other two over the main frame rails and you will hit steel in the floor frame.