The Mog thing is a bit of a dilema. The older Mogs like mine have a cramped cabin. The newer version moved the engine out front more making space for three in the cab. Problem is, the old ones have a cool look, the new ones are very boxy and industrial looking. They lack the character of the old style. There is a configuration that does work though. They make a four door version that can be had with a raised roof. These seat five comfortably but, are rare and more expensive.
On the speed differential threshold. I could open the door and watch the wheel spinning. The truck was stopped, it sure looked like more than a couple miles per hour. Like I said, I think I will do a couple things different next time. I will lift different wheels and try to spin the tires a little faster in an attempt to get the system to kick in.
The system does seem to work just fine in snow and on the flat dirt yard. I did find it to be a little intrusive in the snow but, that is likely due to my heavy foot and a 300hp V8 underhood