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Well that shows you what I know. Pop always handled the registrations on the trucks so I assumed the M was a distance thing. I learn something new every day. All of Pops were 24M but we had some pretty big trucks. Our farm was about 24 miles away too so that just added to that assumtion.
http://allaboutlicenseplates.com/truck.asp?State=Kansas
Truck tags started with T until they changed the design in 1951 and added TRUCK vertically next to the county abbreviation. I think 1951 was the first year they started making them with the state shape (Missouri river squiggle in the upper right corner). I think trailers had to have a weight rating too if they are of a certain size.
https://kansaslicenseplates.com/prod...t-tab-1-12-ton