I am looking at buying a used 6400 series, 7200 series, or 7400 series 4wd JD tractor. I will be disking, baling and snow blowing with it. Does anyone know where I can get overall dimensions on these tractors as I would like to see how much bigger the 2 larger series are compared to my current JD 4030. Tractordata does not have it and I can not find it on the Deere website ? Any comments on these tractors if you own or have had one ? Also I have looked at tractorhouse and machinefinder and they appear to be the best sources for used machines. Any suggestions other than these for finding one. I have contacted the local Deere dealers and they are looking. Thanks for any help.