Which of the following is NOT one of the three main types of vehicle construction?

• A. Full Frame
• B. Unibody
• C. Space Frame
• D. Ladder Frame

Answer: (D)

Vehicle construction centers on how the structure carries and distributes loads, whether the body and frame are a single unit or separate pieces. The three commonly taught categories are unibody (body and frame integrated into one shell), space frame (a lightweight triangulated skeleton of tubes), and full-frame or body-on-frame (a separate chassis that the body is mounted to). Ladder frame is a specific way of implementing a body-on-frame design, with two long rails and crossmembers like a ladder. Because it’s a particular arrangement within the full-frame approach rather than a distinct main category, it isn’t counted as one of the three main construction types. So the ladder-frame option isn’t considered one of the three primary construction styles.