Median annual wages nationally of heavy truck and tractor-trailer drivers were $38,200 in May 2012. The lowest 10 percent earned less than $25,110, and the highest 10 percent earned more than $58,910 annually.
Drivers of heavy trucks and tractor-trailers are usually paid by how many miles they have driven, plus bonuses. The per-mile rate varies from employer to employer and may depend on the type of cargo.
Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2014-2015 edition, Heavy and Tractor-Trailer Truck Drivers.