F/CMVSS 210: Seat Belt Assembly Anchorages

Federal Motor Vehicle Safety Standard (FMVSS) 121 establishes critical performance requirements for air brake systems used on trucks, buses, and trailers. Learn why this standard is important for vehicle upfitters, what...

Vehicle air conditioning systems require proper refrigerant handling during upfitting and service operations. This article outlines important EPA requirements, technician certification expectations, and best practices...

Determining whether a vehicle is classified as a truck or tractor for Federal Excise Tax (FET) purposes isn't always straightforward. This article reviews key IRS considerations, explains why vehicle design matters, and...