Thanks for the information. The mounting brackets on the rear cross sill are the 44 1/4" measurement. So I have a 1/2 ton bed or at least a 1/2 ton rear cross sill on 3/4 ton frame. It is a 51 Chevy, so the long bed is correct. At this point I am thinking of having a frame extension bracket made up for both the length and width needed to use the rear cross sill mounts that are there. Maybe a little gussett under the bracket.
Thanks Martin
