0 18-wheelers available — sleeper and day cab tractors from dealers nationwide
An 18-wheeler (tractor-trailer) is a Class 8 semi truck rated for 80,000 lbs GVW — the backbone of long-haul freight in the US. TruckRadar aggregates sleeper cab and day cab inventory from dealers across all 50 states, updated daily. Filter by make, mileage, price, and location to find the right rig.
No 18-wheelers currently available.
Browse all trucksSleeper Trucks
Long-haul 18-wheelers with sleeping compartment. Raised-roof, mid-roof, and flat-top models.
Day Cab Trucks
Regional and local 18-wheelers without sleeper. Built for drivers home nightly.
An 18-wheeler is a tractor-trailer combination with 18 wheels total — 10 on the tractor (steer axle: 2, dual drive axles: 8) and 8 on a standard tandem-axle trailer. All 18-wheelers are Class 8 vehicles with a GVWR over 33,000 lbs. The term is used interchangeably with semi truck, tractor-trailer, and big rig in the trucking industry.
New 18-wheelers (Class 8 tractors) are priced from roughly $150,000 for a base spec day cab to $200,000+ for a fully optioned sleeper. Used 18-wheelers are listed from around $30,000 for older high-mileage units up to $140,000 for late-model sleepers with low miles. Fleet disposals typically offer 3–5 year old units with 400,000–700,000 miles at $60,000–$100,000.
Federal bridge laws limit a standard 5-axle tractor-trailer to 80,000 lbs gross vehicle weight (GVW) on US interstates. That typically allows 42,000–48,000 lbs of payload depending on tractor weight. Oversize/overweight permits allow heavier loads on certain routes. Spread-axle trailers and additional axle configurations can increase legal payload in some states.
Driving a tractor-trailer combination (any GVW over 26,001 lbs) requires a Class A Commercial Driver's License (CDL). All 18-wheelers require Class A. Additional endorsements include T (doubles/triples) and N (tank vehicles). The Class A CDL requires passing a written knowledge test, a pre-trip inspection test, and a behind-the-wheel skills test with a combination vehicle.
Freightliner (Detroit DD15 engine) and Kenworth/Peterbilt (PACCAR MX-13) consistently rank highest for powertrain reliability and fuel efficiency in fleet owner surveys. Volvo (D13) and International (A26/S13) are strong performers for fleets prioritizing fuel economy. Mack (MP8) and Western Star (DD15/DD16) have loyal owner-operator followings for heavy-haul applications. Reliability ultimately depends on spec, maintenance history, and duty cycle.
Pull the ECM report to verify actual engine hours and fault history — high idle time burns engine life faster than highway miles. Inspect the aftertreatment system (DPF, DEF, EGR) for fault codes; repairs run $3,000–$10,000. Check the fifth wheel plate and kingpin for wear. Examine the frame rails and crossmembers for cracks or prior welds. Test all air systems (brakes, suspension) for leaks. Verify the APU or shore power system operates correctly. Always obtain maintenance records and run a VIN history report.
TruckRadar aggregates active 18-wheeler listings from dealer networks across the US, updated daily. Use the state and city filters to narrow by location, then sort by price, mileage, or year to compare options. Dealer lots often have units available for inspection before purchase — the dealer details on each listing include contact information and location.