The International HX Series is the newest line of severe duty vocational trucks that replaced the WorkStar/7000 Series, starting in 2016. The trucks are available in configurations from 4x2 up to 8x4 (2 drive axles, 1 lift axle, 1 steering axle) , available body to back of cab lengths (BBC) are 120" and 119". The HX520 has a BBC of 120" and a body to front axle lenght (BA) of 29.9" making it a Set-Back Axle. The HX620 has a BBC of 119" and a BA of 50.2" making it a Set-Forward Axle.