An engine-fitted chassis lacks a body (cab, cargo box, or passenger compartment) at the time of importation. Once a body is mounted, the article is typically classified as a complete vehicle under the appropriate heading for its intended use. Importers should document the chassis's condition at the time of entry, as CBP may apply the essential-character test if body components are imported simultaneously.

Yes—870600 covers engine-fitted chassis intended for tractors, passenger vehicles, goods-transport vehicles, and special-purpose vehicles without further subdivision by vehicle type. However, the chassis must be fitted with an engine at the time of importation; a bare frame without an engine is not classifiable here and would fall under a different heading depending on its material and construction.