I will ease your minds a little, I drove a Commander with a Hemi a couple weeks back...its ok, but its no compairison to a H2.
the hemi rocks when you hit the gas and your doing 90 in no time. it bouces all over on the road and has a really low ride height. its more of a freeway cruiser then anything. the fact they opened up head room is nice, but I still didn't fit well. the third row seat almost totally blocks the veiw out the back, so you had better learn to use those mirrors for backing. I didn't get to take it offroad, but I hope to soon.