The Commander uses the ABS system to slow slipping wheels to the same speed as the wheels with traction. So all Commanders have "virtual" LSD's and will get great traction off road.
Of course, you can't beat truly locking the differentials when slogging through deep mud and really loose surfaces, but unless you're looking to do some serious 4 wheelin' the QT2 is going to work just great in most conditions.
If you're Durango is later than 2006 it might have the same feature, Electronic Stability and Traction Control was mandated by law in all 2006 and later vehicles, so I doubt Chrysler limited the advantages of that, that came with the mandate that required just a few more tweaks to improve off roading to just the Jeeps, but I really don't know for sure.
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