The engine options on the Commander range from a V6 to a Hemi V8. So far, only an automatic transmission has been offered.
The Commander comes in either rear wheel or four wheel drive. It is based off the Grand Cherokee, but longer and more square, an obvious attempt to look more like a refined Hummer H3.
The second and third row seats are mounted higher than the first. To allow for headroom, Jeep had to step the roof of the vehicle instead of using one flat top. They disguise this by using a roof rack that lies straight along the sides.
These vehicles are too new to show up in most places where you would find used car listings. You can find them in some of the mass market listings such as eBay.