Motor carriers with just one tractor represent 59.1% of all U.S. carriers but only 8.1% of the tractors and only 4% of the trailers operated by authorized U.S. for-hire tractor-trailer operations. On the other end of the spectrum, carriers with more than 500 tractors make up just 0.1% of all carriers but operate 32.2% of the tractors and 40.2% of the trailers.

Source: FMCSA MCMIS database,May 2020; FTR Analysis