I would be interested to know if anyone can clue me in What the letters after the Kubota B6000 mean? Such as B6000E which I think is 2wd. These letters also appear on the site where you check out to get a ROPS from Kubota. Where do you find these letters? I have a B6000 and I don't find these letter designations anywhere and its a 4wd. Anybody have more information?