Short bed mounting measurements.

[Otis413]

My current rebuild looks like I'll have a spare bed in repairable shape (cosmetic rust mostly) and I'm planning to make a trailer out of it, with a topper/cap, it could come in handy.
So while the bed was off I took some measurements in order to build my trailer frame. (I have some 6" channel from an old mobile home that should work nicely.)
So, here are my measurements for anyone who might find them useful.