2019 Peterbilt Trucks For Sale in Illinois

Start with the truck’s intended application. A day cab with a shorter wheelbase and lighter spec fits regional freight, dedicated lanes, and port or terminal work. An 80-inch sleeper with larger fuel capacity, an APU, and a refrigerator is better suited to over-the-road use. After that, compare engine rating, transmission type, rear axle ratio, suspension, fifth wheel setup, and total miles. On a 2019 579, those factors have more impact on operating cost and usability than appearance items.

The most common engines in 2019 Peterbilt highway trucks are the Cummins X15 and PACCAR MX-13. Both are established heavy-duty platforms, but buyer preference often comes down to fleet standardization, local dealer support, and service history. Cummins-equipped trucks are popular in many second-owner markets because of broad parts and service access. The MX-13 is also widely used and can be a strong choice when maintenance records are complete and the spec matches the job.

Yes. The 579 was designed as a fuel-efficient on-highway tractor, and it works well in both regional and long-haul operations when the spec is right. Day cab versions are common in regional haul, dedicated freight, and shorter route cycles. Sleeper versions, especially UltraLoft configurations, are common in long-haul service because they offer improved driver space, fuel capacity options, and room for sleeper equipment such as APUs and refrigerators.

Rear axle ratio affects cruise RPM, launch performance, and fuel economy. A faster ratio such as 2.64 or 2.79 usually supports highway fuel economy, while a ratio like 3.08 can offer a different balance of pulling power and operating feel depending on load and terrain. Wheelbase matters for bridge law flexibility, trailer gap, turning radius, and ride quality. Buyers in Illinois often compare these specs closely because they influence both interstate efficiency and how the truck fits local freight lanes.

Common features include air ride suspension, tilt and telescoping steering, cruise control, power windows, cab extenders, side fairings, and aluminum fuel tanks. Sleeper models may also include an upper bunk, bunk heater, auxiliary power unit, and refrigerator. These items affect resale value and driver retention, but they also matter for idle reduction, overnight comfort, and total operating cost. On a 2019 model, the presence of collision mitigation, disc brakes, and well-matched aerodynamic equipment can also be a meaningful advantage.