Went to look at 1440,guy misspoke it was a 1420.. I had looked up info on the 40 before I went. Short story is I ended buying the 20 anyway thinking(or not) that they were similar.After looking up specs I'm now aware there is a huge difference.lawn vs garden tractor and about 240 lb of what? That is my question what are the primary mechanical differences..Older experienced gentlemen please reply...While I just set and feel a bit stupid..enthusiam got in the way of reality again...