Fumblin, there is an error in the '53-'55.1 section of the Stovebolt Model/Series page. The size descriptions are shifted up/down relative to the model/series/WB columns by the word "chassis" wrapping to the next line for the forward controls.
J should be the 3600 Comm. 3/4-ton conventional, not forward. K is 3700 forward control. Also, the Utility 1.5 ton should start with N 4100.