Today I had my outlook awd parked on the side of the road, on some wet grass, in a small ditch, and when I put the car in reverse and tried to backup, the front tires spun and the car would not moved backward. I was able to pull forward instead. I thought with awd the rear tires should have pulled me out. Maybe awd does not work for the reverse gear? That makes no sense. I am not certain if my awd is working correctly. No dash warning signs or any other indication of problems. Any thoughts?