Heavy truck sales really collapsed during the recession, falling to a low of 181 thousand in April and May 2009, on a seasonally adjusted annual rate basis (SAAR). Then sales increased more than 2 1/2 times, and hit 479 thousand SAAR in June 2015.
Heavy truck sales have since declined again - probably mostly due to the weakness in the oil sector - and were at 374 thousand SAAR in October.
Even with the recent oil related decline, heavy truck sales are at about the average (and median) of the last 20 years.
Click on graph for larger image.
Sales have been at about the same level for four consecutive months. It is possible the oil related slump in heavy truck sales is over.