The rear outboard head restraints can be removed if they interfere with the proper installation of the child restraint.
To remove the head restraint:

Warning
With head restraints that are not installed and adjusted properly, there is a greater chance that occupants will suffer a neck/ spinal injury in a crash. Do not drive until the head restraints for all occupants are installed and adjusted properly.
To reinstall the head restraint:

If necessary, press the height adjustment release button to further lower the head restraint.
See Head Restraints on page 3-2.
Securing a Child Restraint Designed for the LATCH System
Replacing LATCH System Parts After a CrashHome Page (Radio with Touchscreen)
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Different Size Tires and Wheels
If wheels or tires are installed that are a different size than the original
equipment wheels and tires, vehicle performance, including its braking, ride and
handling characteristics, stability, and resistance to rollover may be affected.
If the vehicle has electronic systems such as antilock ...
Tires
Every new GM vehicle has high-quality tires made by a leading tire manufacturer.
See the warranty manual for information regarding the tire warranty and where to
get service. For additional information refer to the tire manufacturer.
Warning
Poorly maintained and improperly used tires are d ...