Where can one find used commercial trucks for sale?

Where can one find used commercial trucks for sale?
To find a used commercial truck that is for sale, there are options such as websites that are set up for just that buying option. Another suggestion would be to contact trucking companies and ask if there are any trucks in the companies inventory that may not be in use any longer, allowing for a cheap used commercial truck to be sold at a reduced price so that they can move the truck off of their property and make room for new trucks that will benefit the costs of the company better. Be sure when buying a used commercial truck to have a mechanic check out the mechanical functionality of the vehicle to assure it is worth the buy.