RV8guy

I need a new bed for my pickup. The 7 foot long bed. I've been looking for a long while and there are none within driving distance of where I live. What I most likely will end up doing is buying two short beds and building what I need.

Does anyone have any measurements for the long and short beds? Total length is easy to find but I'm looking for the distance from the front of the bed to the center line of the axle and from the center line of the axle to the back of the bed for both versions.