It used to be people preferred the D1 because of fully floating axles and standard CDL built in.. I've owned my D2 for 15 years, and it's been a very "reliable" vehicle overall.. That's not to say it doesn't need constant attention, and I did have to rebuilt the engine.. Never left me on the trail and only twice needed to tow home, once then the engine blew and once for Crank Sensor.