Independance of the wheels
I can't help much on the technical side, but I have some comments. The Hybred Hylander is a performance SUV not an efficiency car. While it does get much better milage than it's gas sister the electrics add Horse power. But to keep it going at highway speeds or up hill it still needs the whack of a good gas engine.
The four wheels are indpedent on drive and brake. The Electronic stability control needs this to be able to stabilize by braking or thrust any wheel separately. And it works like magic. If your car is not going the directin the wheels are heading, the car will take over and fix it. you hear a smoke dector type beeping and you are straightened out on the road. Worked once for me already, saved me an accident. Good luck in your info search.