How to measure the width of a truck frame?

[sixdogs]

I have a Ford farm truck I want to get a flatbed body for and most beds are for frames of 32" or 34". How is that measured?

My frame is 33 3/4" outside edge to outside edge of the frame and 31" center to center. Do I have a 32", 34" or neither?

Thanks in advance.

 

[mrmikey]

Measured outside, 34" frame. It'll vary if it's a single frame, double frame, the crossmembers are the same width so the outside varies.................M

 

[sixdogs]

Thank you.