Who is lucky enough to still have one or more of dad's or grandpas tractors ? I have grandpas 4020 and 420 crawler tractors. I learned to drive tractor on the 4020 and I remember one of my first jobs was baling straw with a new holand square baler one fall after school then I learned to spray grain for wild oats and thistles which has always been a favorite job of mine . then I did fall plowing with the 4020 and an ih 550 semi mounted plow I kind of took over the 4020 and grandpa ran the 4320 . in the spring we would put duals on the 4020 and pull a 25 foot melroe multi weeder with spring tine harrow sections.