Chevrolet EXPRESS - 2011 Manual page 364

Two-wheel-drive vehicles should
not be towed with all four wheels on
the ground.
Two-wheel-drive transmissions have
no provisions for internal lubrication
while being towed.
The vehicle was not designed to be
towed with all four wheels on the
ground. To properly tow these
vehicles, they should be placed on
a platform trailer with all four wheels
off the ground.
Use the following procedure to
tow the vehicle from the rear:
1. Attach the dolly to the tow
vehicle following the dolly
manufacturer's instructions.
2. Drive the rear wheels onto
the dolly.