Kubota L3010, JD 325, JD LX255, JD355D, several restored 1939 to 1952 Ford N’s
Tracked conversion units to fit the Ford N series were on the market within a year or so of the tractor's introduction in 1939. The units were popular in snow country and are valuable collectors item today. Tracks on farm tractors is a very proven technology.
Having said that, my L3010 with 4WD beats my 1940 Ford with chains. Both need all the weight they can get