New and used 2026 GMC Sierra 2500 AT4 trucks for sale near Monrovia, MD

Our salesman was Scott. Extremely knowledgeable and helpful. Entire experience (bought a 2026 GMC Arcadia) at the dealership was excellent. We moved quickly through the process. Will go back for future vehicles.

Loving my Customizers truck. Just came in for my first oil change. Sales and service is always very friendly and helpful. Logan and Kyle always make sure I am completely satisfied.

My husband and I were so pleased with our recent purchase of a new truck from Koons in Clarksville. Our sales person Jack was absolutely amazing. From pricing to just plain great customer service we were so pleased. No pressure just a great deal. Thanks Jack. Will definitely share our experience with others.

We received outstanding customer service from Luis Arredondo when buying a 2023 Chevy Bolt, which I am very content with and enjoy driving. The price was reasonable. Luis was always responsive to our inquiries and focused on our needs. I also really appreciate their Sunday sales hours. Service was great in reprinting the key.

Kacey B is a fantastic Service Rep !!…No!, the BEST Service rep of my 48 years of buying GM automobiles, and One of the main reasons we like Koons! Parts Dept. and Frank also great to deal with!! And when I need both- fantastic team !! Service is always timely, job is done correctly. Nothing but kudos for this team !! A+

Scott was awesome to work with. Very knowledgable and help full without being pushy. The dealership had a great selection of SUV's, so we had plenty to choose from and we are very happy with our selection as well as the whole process from sales to finance. All a great experience and that doesn't seem to happy often anymore.

Whoa! What a great experience buying a car with Chase McCoy. From the initial introduction, through the final (Red Carpet) pictures to complete the delivery, Chase was beyond easy to work with. He was very attentive, far from over bearing, and extremely thorough. Also, Chris Gaston in (Management), structured a phenomenal deal that we were unable to refuse. Both Chase and Chris made car buying extremely easy, and most certainly a very memorable experience. When the need/want arises will not hesitate to buy from Chase McCoy again.

Without a doubt, this car buying experience stands out as the best one I've had so far! Having bought more than 10 cars in the past, I can confidently say that Ralph and Anthony were incredibly professional, honest, and patient throughout the entire process. Their approach made us feel like part of the family rather than just another customer, and they were attentive to our family's specific needs. Jessica also made the final steps a seamless process without trying to sell us things we didn’t need! We are absolutely thrilled with our new Acadia! I wouldn't hesitate to recommend Sheehy to everyone I know, and I would gladly return as a repeat customer in the future. Thank you Anthony, Ralph, and Jessica!!!

Super professional. Easy process. Salesperson Steve was on top of every step. I will recommend this dealer anytime.

My husband and I just bought a GMC SUV used from Sheeny GMC in Hagerstown Maryland. Donovan Loudan was amazing! So helpful, kind, and caring! Donovan answered all our questions before buying, and never pressured us in anyway. The SUV looked and drove like new too. We love our new to us GMC SUV! Not only Donovan, but everyone we came into contact were very friendly and helpful. If you need a new or used vehicle we would highly recommend Sheeny GMC in Hagerstown MD, ask for Donovan.