The jeep liberty in this set up with the part time 4 wd is a remake of the old Jeep cherokee Classic . For those who drive with a lead foot, it sorely needs weight in the back like a pickup and probably better winter tires too this winter if you drive in snow. But unlike a pick up, owners are less apt to throw tube sand or the like in the back because of the loss of room in the back. 4 bags,of 70 lbs each tube sand would help emensely. I have driven these things and the only use that makes them worth keeping for me is towing and off road. If you use these old school for SUVs drive trains for on road use alone and don't adjust your driving habits, I feel you would be much better served by an awd compact suv like an Escape, Compass from jeep, CRV or Rav for those jack rabbit starts. Every other truck based Suv would do the same in two wheel drive when driven this way with no added weight in the back.
The typically incompetent sales person should have steered you to an awd model if you don't tow or drive off road frequently. I feel these types of SUVs with your drive train are much more specialized then buyers think and could lead to control problems too while driving in slippery weather if you are not more careful.