NAICS 33621 - Motor Vehicle Body and Trailer Manufacturing

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What is NAICS 33621

NAICS code 33621 encompasses establishments engaged primarily in the manufacturing of motor vehicle bodies and cabs, as well as truck, automobile, and utility trailers. This sector includes the production of truck trailer chassis, detachable trailer bodies, and chassis that may be sold separately or assembled on purchased chassis to form complete vehicles. Products such as motor homes, which integrate the motor and living quarters in a single unit, and travel trailers designed to be towed by motor vehicles, fall within this classification. Businesses operating in this sector range from specialized manufacturers of truck bodies and camper units to producers of recreational trailers and semi-trailers. Government agencies contract for these services to meet transportation, logistics, emergency response, and recreational needs, ensuring tailored vehicle solutions for diverse operational requirements. The specialized nature of the products often requires custom manufacturing capabilities and adherence to regulatory standards, making these contractors valuable partners in government fleet and equipment procurement programs.

Industry Classification for NAICS 33621

This industry comprises establishments primarily engaged in (1) manufacturing motor vehicle bodies and cabs or (2) manufacturing truck, automobile and utility trailers, truck trailer chassis, detachable trailer bodies, and detachable trailer chassis. The products made may be sold separately or may be assembled on purchased chassis and sold as complete vehicles. Motor homes are units where the motor and the living quarters are contained in the same integrated unit, while travel trailers are designed to be towed by a motor unit, such as an automobile or a light truck.

Illustrative Examples:

  • Bodies and cabs, truck, manufacturing
  • Camper units, slide-in, for pick-up trucks, manufacturing
  • Pick-up canopies, caps, or covers manufacturing
  • Motor homes, self-contained, assembling on purchased chassis
  • Semi-trailers manufacturing
  • Travel trailers, recreational, manufacturing

Breakdown for NAICS 33621

  • Manufacturing of motor vehicle bodies and cabs including truck and automobile bodies.
  • Production of truck, utility, and recreational trailers including chassis and detachable bodies.
  • Includes assembly of motor homes and travel trailers on purchased chassis.
  • Products sold either as separate components or fully assembled vehicles.
  • Typical business sizes range from small custom fabricators to large-scale manufacturers.
  • Sector supports government and commercial transportation, logistics, and emergency services.

Included Activities for NAICS 33621

  • Manufacturing truck and automobile bodies and cabs.
  • Producing utility and recreational trailers including travel trailers and camper units.
  • Assembling motor homes on purchased chassis.
  • Fabricating semi-trailers and detachable trailer components.
  • Customizing vehicle bodies to meet specific government operational requirements.
  • Repairing and refurbishing motor vehicle bodies and trailers.
  • Designing trailers and vehicle bodies for specialized applications.
  • Supplying components and parts related to trailer chassis and bodies.

Business Types for NAICS 33621

  • Motor vehicle body manufacturers
  • Trailer and semi-trailer manufacturers
  • Custom vehicle assembly companies
  • Recreational vehicle (RV) manufacturers
  • Specialty vehicle fabricators
  • Small and medium-sized manufacturing enterprises

Government Buyers for NAICS 33621

Federal, state, and local government agencies are the primary purchasers of products and services classified under NAICS 33621. Agencies such as the Department of Defense, Department of Transportation, and various emergency management and public safety organizations procure motor vehicle bodies, trailers, and specialized vehicle assemblies to support their mission-critical operations. These vehicles are essential for transport logistics, mobile command units, disaster response, and recreational or utility purposes within government fleets. Additionally, agencies involved in infrastructure maintenance and environmental services require custom trailer solutions for equipment transport and operational mobility. The need for durable, reliable, and sometimes customized vehicle bodies and trailers drives government demand in this sector.

Contract Types & Procurement for NAICS 33621

Contracts under NAICS 33621 typically include firm-fixed-price, indefinite delivery/indefinite quantity (IDIQ), and cost-plus contracts, often awarded through competitive bidding processes or set-asides for small businesses. Procurement methods can involve requests for proposals (RFPs), invitations for bids (IFBs), and simplified acquisition procedures depending on contract size and government agency. Contract values vary widely, from smaller purchases of specialty trailer units to multimillion-dollar contracts for large-scale vehicle body manufacturing and assembly. Long-term contracts may include maintenance and refurbishment services in addition to manufacturing, reflecting ongoing government fleet management needs. Contractors often engage in subcontracting and partnership arrangements to meet complex specifications and delivery schedules.

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