Semi Truck Dealers

Heavily — arguably more than on any other vehicle purchase, because downtime directly costs you revenue. A truck in the shop for a week isn't hauling loads or making payments. Before you buy, ask concrete questions: What are your service hours and do you have night or weekend coverage? How many bays and techs? Do you offer mobile or roadside service? What's your typical turnaround on an engine or aftertreatment repair, and how fast do you handle warranty claims? Then look at what verified buyers say about the dealer's shop, because a strong service department is what separates a dealer who sold you a truck from one who keeps your operation running.

Pull the ECM data if you can — it shows actual miles, engine and idle hours, and fault history that the odometer alone won't tell you. Ask for maintenance records, confirm the DOT/annual inspection status, and inspect the big-ticket items: engine (oil leaks, blow-by), transmission and clutch, brakes, tires, and frame or rust on the chassis. On newer trucks, pay close attention to the emissions aftertreatment — DPF, DEF and EGR problems are common and expensive, so make sure it's not throwing codes or in a derate. For a serious purchase, a pre-buy inspection by an independent shop is money well spent, and a reputable dealer won't object.

Ask two things: is the truck's emissions system healthy, and is the truck legal where you plan to operate. On the health side, confirm the aftertreatment (DPF/DEF/EGR) is functioning, not deleted, and not throwing faults — repairs here are among the most expensive a modern diesel will see. On the compliance side, some states, California in particular, have clean-truck and CARB rules that restrict which model-year engines can operate or register there, and those rules have been tightening. If you run interstate or are buying an older truck, ask the dealer directly whether it complies where you'll run it. Getting this wrong can leave you with a truck you can't legally use.

New trucks give you full warranty, the latest emissions and fuel economy, and let you spec the truck exactly to your work — but they carry the steepest depreciation and price. Used saves money up front, trading warranty for someone else's miles, so disclosure and inspection matter most. Spec'ing is critical either way: engine, horsepower and torque, transmission type, axle ratio, wheelbase and suspension all need to match your loads, routes and terrain. The wrong axle ratio or an over-spec'd truck costs you in fuel or resale for the life of the truck. A good dealer digs into your operation before quoting; be wary of one that just points at what's on the lot.