Which part of a vehicle is often inspected for unibody damage?

The A, B, and C pillars of a vehicle are critical structural components that provide integrity to the unibody design. Unibody construction is a method in which the body and frame of the vehicle are a single unit, promoting strength and rigidity. The A pillars typically frame the windshield, the B pillars are located between the front and rear doors, and the C pillars support the rear portion of the vehicle. Damage to any of these pillars can compromise the overall structural integrity, safety, and crashworthiness of the vehicle. Inspecting these areas is essential to assess any structural impact that could affect the vehicle's performance.

In contrast, while the roof is indeed an important structural element, it is not as directly related to the foundational aspects of unibody damage as the pillars. The wheels and undercarriage are crucial for the vehicle's handling and operational aspects, but they are less relevant when discussing the specific structural integrity associated with unibody construction.