This graph shows heavy truck sales since 1967 using data from the BEA. The dashed line is the July 2023 seasonally adjusted annual sales rate (SAAR).
Heavy truck sales really collapsed during the great recession, falling to a low of 180 thousand SAAR in May 2009. Then heavy truck sales increased to a new record high of 570 thousand SAAR in April 2019.
Note: “Heavy trucks – trucks more than 14,000 pounds gross vehicle weight.”