Actually the reason you have to flatbed an AWD is because if any 2 wheels are touching the ground while 2 others are raised (it doesn't matter which 2), it will shred the transfer case within a few feet. If anyone ever towed my GSX without a flatbed, you can bet my lawyer will get me another car. The driveshaft spinning doesn't affect carrier bearings or output shaft bearings, it's connected to the front wheels through the transfer case. You wouldn't tow a 4X4 like that with 2 wheels off the ground, would you? Same principle.