During a left- and right-rear side inspection, what should be checked about the dual tires?

The dual tires on a vehicle should be inspected to ensure they do not come into contact with each other. This is important because if the tires are making contact, it can lead to uneven wear, potential damage, or failure of the tires, which compromises the safety and performance of the vehicle.

Maintaining appropriate spacing between dual tires helps to prevent issues such as excessive heat buildup and ensures that each tire can perform optimally under the weight of the vehicle. Proper separation is particularly crucial in ensuring stability and traction, especially during maneuvers.

The other aspects of tire inspection—size matching, inflation, and tread wear—while important in their own right, focus on different areas of tire health and performance. However, the primary concern during inspections regarding dual tires is ensuring they do not touch, as this is a direct risk factor for tire integrity and operational safety.