After searching the site unsuccessfully for an answer regarding short running boards for A.D. 3809, 4409, and 6409 Rack body truck, a member asked me the following question:

"Are the short running boards for AD rack body 3809 (1 ton), 4409 (1 1/2 ton) ,and 6409 ( 2 ton) all the same?"

Here is some information, before looking for an answer:

1947-1954 Advance Design
3809 : 1 ton stake truck
4409 : 1.5 ton stake truck
6409 : 2 ton stake truck

Master Parts Book - pertinent page

My guess is that they use the same running boards?
What is UTIL (in Master Parts Book)? I'll look this up after I tend to my grandchildren.
My guess is cab with "special bed/rear-equipment"?

Please post confirmation or not.