I should have asked previously but do you have anything in writing to support the claim that it has a tow package?
If you do, I would think it a very good case to sue for.
If you don't, you will have to prove that the salesman did represent it as having a tow package and your purchased the vehicle due to that material misrepresentation.
yes, a salesman, or more accurately, his employer can be held to the statements if it is provided as a statement of fact and you depended on that statement as your reason to purchase the vehicle and he was aware of the requirement of the inclusion of the equipment.
so, if you go to a dealership and say; "I'm looking for a truck set up to tow my boat" and he sells you the vehicle with the statement, "this little beauty right here is just what you need. It has a trailer towing package on it and is more than capable of towing your boat"
if the truck he just presented is not as he stated, first, he is misrepresenting the vehicle. Then, there is what is called an implied warranty of fitness.
Implied Warranty of Fitness
When a buyer wishes to use goods for a particular, nonordinary purpose, the UCC provides a distinct implied warranty of fitness (§ 2-315). Unlike the implied warranty of merchantability, the implied warranty of fitness does not contain a requirement that the seller be a merchant with respect to the goods sold. It merely requires that the seller possess knowledge and expertise on which the buyer may rely. (especially because this was a Chevy at a Chevy dealership, he can be considered to possess knowledge and expertise on a Chevy truck)
For example, one court found that horse buyers who indicated to the sellers their intention to use the horse for breeding were using the horse for a particular, nonordinary purpose (Whitehouse v. Lange, 128 Idaho 129, 910 P.2d 801 [1996]). The buyers soon discovered that the horse they purchased was incapable of reproducing. Because the court found this use of the horse to be nonordinary, the buyers were entitled to an implied warranty of fitness.
Before a court will imply a warranty of fitness, three requirements must be met: (1) the seller must have reason to know of the buyer's particular purpose for the goods; (2) the seller must have reason to know of the buyer's reliance on the seller's skill and knowledge in furnishing the appropriate goods; and (3) the buyer must, in fact, rely on the seller's skill and knowledge. Even when these requirements are met, courts will not imply a warranty of fitness under certain circumstances. A buyer who specifies a particular brand of goods is not entitled to an implied warranty of fitness. Also, a buyer who has greater expertise than the seller regarding the goods generally is precluded from asserting an implied warranty of fitness, as is a buyer who provides the seller with specifications, such as a blueprint or design plan, detailing the types of material to be used in the goods.
so, depending on what you can prove the salesman said and what you told him you needed in a truck, you could have a good claim based on the implied warranty of fitness argument.
and no, it is not the responsibility of the salesman. The dealership is liable for their salesmen's commitments to a customer. The salesman only works for the dealer. To support that, who did you buy it from? The dealership, not the salesman. The salesman is an authorized agent of the dealership allowed to represent the dealerships interests in sales transactions. As such, the dealership can be held to a statement by the salesman.