Haven't towed one, but the manual says towable with Transmission in Neutral and Key in Accessory.
Just saying, but it sounds to me like bearing damage could stem from towing with the Steering Column LOCKED, not in ACC.
Would also expect rubber scrubbed off the front tires. What do they look like?
Snippet from 2010 Malibu Owner's Guide follows:
To dinghy tow the vehicle from the front with all four
wheels on the ground:
1. Position the vehicle to tow and then secure it to the
towing vehicle.
2. Shift the transmission to P (Park) and turn the
ignition to LOCK/OFF.
3. Set the parking brake.
4. To prevent the battery from draining while the
vehicle is being towed, remove the following fuse
from the instrument panel fuse block: (IGN SENSOR).
See Instrument Panel Fuse Block on page 6 ? 105 for more information.
5. Turn the ignition to ACC/ACCESSORY.
6. Shift the transmission to N (Neutral).
7. Release the parking brake.
Remember to reinstall the IGN SENSOR fuse once the
destination has been reached.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB