Welcome to Coy's Diesel , home of the best used diesel trucks and parts in Gonzales, LA. We have worked hard to build a reputation for selling high quality used diesel trucks backed by extraordinary service. Most of our business is done with individuals who've never even driven the vehicle or seen it in person prior to purchasing. Only Welcome to Coy's Diesel , home of the best used diesel trucks and parts in Gonzales, LA. We have worked hard to build a reputation for selling high quality used diesel trucks backed by extraordinary service. Most of our business is done with individuals who've never even driven the vehicle or seen it in person prior to purchasing. Only two things make that possible: unequaled quality and a high level of service. ...more