Slopes and XY axis - Player Bounding Box Rotation

Does any one have any idea how to get player objects to rotate along the X and Y axis when they are one a hill slope. The Racing starter kit shows that the vehicle bounding box rotates in the approrate direction along the X and Y axis when it is on a slope. How can this be implemented on an player object. For bipeds this is not an issue but for animals such as horses it is a MAJOR draw back. Imagine a horse climbing up a hill without rotating its body to match the slope - NOT VERY PLEASANT. I havent seen this addresed anywhere in the forums. Animals follow the slope perfectly in the game Wildlife Tycoon: Venture Africa. Player objects DO NOT rotate along the X or Y axis even if you use setTransform(). They only rotate along Z axis. There must tbe some way to rotate them.