Medium Duty 348

The Peterbilt 348 is a Class 7 or 8 vocational truck, designed for heavy-duty work requiring durability, versatility, and a robust chassis. It’s a top-tier offering in Peterbilt’s medium-duty vocational range and shares many components with Class 8 trucks, making it ideal for demanding commercial and municipal tasks.

The 348 is a go-to platform for:

• Dump trucks and snow plows
• Concrete mixers
• Utility and crane trucks
• Fuel, lube, or vacuum tankers
• Roll-off or hook-lift systems
• Fire/rescue and municipal fleet trucks

Its heavier-duty axles and frame rail options allow for heavier payloads and more rugged vocational equipment compared to lighter Peterbilt 3-series models.

Cab Type:

The Peterbilt 348 features the 1.9-meter narrow cab—the same vocational aluminum cab found in the 325, 330, 335, and 340. This cab is narrower than the highway-style 2.1m cab but is rugged, easy to upfit, and designed to withstand vocational environments.

Aftermarket Seat Compatibility:

The 348 uses the standard vocational bolt pattern: approximately 4.68" x 12". That means most medium-duty and vocational aftermarket seats will fit, especially those designed for narrow-cab applications.

Recommended aftermarket seats:

• Knoedler Harrier – compact air-ride option for tight clearance
• National Corsair or Ensign – widely used in vocational applications
• Bostrom Wide Ride Core or T-Series – check base height and width

Installation Notes:

• Many seats will bolt directly to the floor or require simple adaptor plates.
• Be mindful of floor obstructions (e.g., HVAC units, battery boxes) under or behind the seat.
• Low-profile suspensions are preferred to preserve headroom and steering clearance.
• If adding features like armrests or wide cushions, ensure there's enough space between the seat and door or console.