the 3/4T 3600 WB is 123" [no short version], the 1T 3800 WB is 135" ... the 3/4T bed is about 8'2" [same as long 1/2T], the 1T bed [step] is about 9'2" to match the longer WB .... it may be that someone came up with a fleet bed to put on a truck that had no bed - just do some measuring and see if the bed fits the frame, if the bed is 9' it's a very rare piece!
Bill
