Wouldn't the rear diff be an advantage for towing? My D1's rear auto locker certainly helps a lot towing our camper trailer up tricky tracks. It got us through the OTT towing our camper without getting stuck once, whereas other vehicles, not towing and without a rear locker, got stuck spinning wheels in slippery spots. Of course, I don't have traction control, so can't comment on that in the D4 with or without the locker.
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