Diesel Fuel Truck Tanks For Sale by OILMENS. In addition to being one of the largest dealers of new and used truck tanks in North America, we take great pride in building superior units that allow operators to work more efficiently, eliminating or reducing redundant or cumbersome tasks. When your operator works more efficiently, he can deliver to more customers each day, maximizing your profits. Our customer testimonials confirm that when you deal with Oilmens, you deal with a company of experienced professionals that you’ll come to know and trust.