What is the main feature of a full frame vehicle design?

The main feature of a full frame vehicle design is that the body is separate and mounted on the frame. This traditional design consists of a robust chassis that supports the vehicle's structure and mechanical components, while the body sits on top of this frame. This separation allows for greater versatility in terms of body styles and ease of repair and modification since the frame can absorb impact and stress, protecting the passenger compartment.

This design is particularly beneficial for larger vehicles, such as trucks and SUVs, because it provides added rigidity and strength, enhancing performance in towing and off-road situations. The full frame design contrasts with unibody structures, where the body and frame are combined into a single unit, offering less weight but potentially less structural integrity under extreme conditions. The choice of materials is not a defining factor for classification as a full frame vehicle, thus the options regarding the specific material or its application to only passenger cars are less relevant to the essential characteristics of frame design.