Ive been thinking about building a couple of flat deck/beds for 2 of my trucks.
When I get to measuring I come up with lots of diffrent frame widths?

79 F-250 4x4, 76 F-250 4x4 , 78 F-350 2 wldr, all pickups and all with diffrent frame widths?

 

Yep, they are all different. The 79 F-250 is the only one that uses a standard pickup bed. The other two use frames which are specific to that model only.