Technician A says that unibody vehicles are generally lighter and more fuel efficient than body-over-frame vehicles. Technician B says that full-size trucks always use body-over-frame construction. Who is correct?

Both technicians are right.

Explanation:

Unibody vehicles have their body, floor plan, and chassis formed into a single structure. These vehicles are generally lighter and more rigid than body-over-frame vehicles. The fact that they are lighter than body-over-frame vehicles means that they have lesser weight to power ratio, which means compared to a body-over-frame vehicle, they will use a lesser amount of fuel to move through the same distance than the body-over-frame would use. This makes unibody vehicles more fuel efficient. Body-over-frame types of vehicles  are made up of a separate body, mounted on a relatively rigid vehicle frame or chassis that carries the powertrain (the engine and drivetrain). This was the original method of building automobiles, is now used mainly for pickup trucks and SUVs.

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explanation: