Medium Duty 537 548 2.1m cab

The Peterbilt 537 and 548 are part of Peterbilt’s latest medium- and heavy-duty vocational lineup, introduced in 2021. Both trucks share the 2.1-meter wide cab and are built for work truck versatility, with durable frame options and upgraded driver environments.

• Peterbilt 537: A Class 7 medium-duty truck, great for heavier regional and vocational work.
• Peterbilt 548: A more robust Class 8 vocational chassis, often spec’d with tandem axles and heavier-duty components.

These models are ideal for fleets and municipalities that need modern ergonomics in trucks that can still take a beating.

Cab Type: 2.1-Meter Wide Cab

• Shared with: Peterbilt 535, 536, 567, and Kenworth T280, T380, T480
• Provides greater interior room, improved visibility, and better insulation
• Supports larger seats, premium trim, and digital dash options

Aftermarket Seat Compatibility

Because the 537 and 548 use the 2.1m wide-body cab, the seat bolt pattern is 6" x 12", not the standard vocational 4.68" x 12" - an adaptor plate is most likely needed.

• Seats Inc. Legacy series (High Back or LO) — with 2.1m cab adaptor
• National Admiral CT or Commodore — fits with 2.1m cab adaptor plate
• Knoedler Air Chief or Extreme LowRider — with 2.1m cab adaptor
• Gramag Smart MR or eVolution — adaptor available for 2.1m wide-body cabs

Installation Notes

• Always confirm your cab width (2.1m) using your build sheet or VIN data.
• Some wide-base suspensions may restrict travel due to proximity to door trim.
• Low-profile seats are often a better fit if your 537/548 is spec’d with a raised floor or center console.
• For electric features like heat, cooling, massage, or lumbar, confirm 12V power availability.