2020 Peterbilt Box Trucks For Sale

Compare 2020 Peterbilt box trucks for sale by chassis rating and usable body space, not box length alone. The Model 337 is a key conventional-cab choice for this year, while heavier applications may use a Model 348 chassis. These straight trucks, also called cube trucks, handle furniture, appliances, packaged goods, and palletized deliveries. A nominal 26-foot body does not establish payload or usable clearance. Measure interior dimensions, rear-door opening, wheel-box intrusion, and floor height against the freight and handling equipment the truck must carry.

The 2020 model year belongs to Peterbilt's earlier medium-duty generation, before its subsequent cab redesign. PACCAR PX-7 and PX-9 diesels are relevant engine choices, with Allison automatics common in delivery configurations. Verify the actual engine, horsepower rating, transmission model, and axle ratio from build records rather than assuming every 337 is equipped alike. A 2020 diesel uses DPF and SCR aftertreatment with DEF, making emissions-system condition a major ownership consideration. Engine hours and idle time can reveal demanding service that mileage alone misses.

For a used truck, request ECM information, preventive-maintenance records, DPF cleaning history, and documentation for emissions repairs. Check for active and recently cleared faults, repeated regeneration complaints, coolant loss, oil leaks, and poor cold starts. Inspect Allison shift quality both cold and fully warm, and verify transmission servicing against the applicable schedule. Box-body condition deserves equal attention: examine floor crossmembers, rear sill, roof seams, mounting hardware, and door tracks. Operate any liftgate through complete cycles under a safe test load, checking hydraulic leaks, platform alignment, wiring, and battery condition.

Across the United States and Canada, route conditions change the inspection priorities. Northern service calls for close examination of frame rails, brake plumbing, electrical connectors, and body supports exposed to road salt. Cold-weather operation also makes battery capacity, coolant protection, starting aids, and air-system maintenance significant. Long wheelbases that accommodate large bodies need adequate turning space and rear-overhang clearance. Confirm legal axle loads and overall dimensions for the states or provinces of operation; combined axle ratings alone do not establish the truck's certified GVWR.

For any 2020 truck represented as new or never titled, verify its sale history, warranty commencement dates, and storage maintenance. Chassis, engine, body, and liftgate coverage can have different terms, and model year alone does not establish remaining protection. Inspect tire date codes, seals, batteries, and fluids even when mileage is minimal. Qualifying new heavy-truck sales can incur the 12% U.S. federal excise tax, but not every medium-duty box truck qualifies. Obtain documentation establishing the vehicle's tax treatment rather than assuming new and used transactions are handled alike.