New and used 2026 GMC Sierra 1500 trucks for sale near Montello, WI

West Side GM is genuinely committed to providing the best customer service! We purchased a used Malibu and the entire process was smooth from meeting with Jeff Maldwin to the finance manager. Jeff was very friendly, knowledgeable and walked through all of the details of the car, while being respectful of our time. I highly recommend this dealership for purchasing your next vehicle!

It was such a good truck honstly the greatest thing I have ever drove in my entire life I am so happy that I have been blessed with this being my first ever car

I bought a vehicle a few years back from Julia and I wanted to take a moment to share how amazing Julia and her team are. They treated me like I was the only customer theret and were professional and attentive. I still have my car and love it. I would go back to Julia to buy a car again and I live in ILLINOIS!!

Mike and Tommy did an awesome job Mike found what we wanted and keep us in the loop Thank you fellas !!

Worked with Jeremy to order our new 2024 Yukon XL. He made the process so easy and quick! We are so happy with our vehicle and our experience! Thank you Jeremy and the Don Larson team!

I had new tires put on my Chevy Malibu and the entire service team was friendly and professional. They were upfront about the timeline and had an area which allowed me to work. Highly recommend!

We had a wonderful experience purchasing our vehicle from Trecek Automotive! One Saturday morning my husband and I were in Portage and had some extra time, so we decided to stop by to test drive a few trucks. Over the past few months we had narrowed it down to two different trucks styles that we were interested in. The test drives were going to help us to make the decision for when we were ready to purchase in a few months. Kipp was the one to assist us. His body language and no sales gimmick's is what kept us there that day. If there had been any pressure or "salesman talk", we would've walked away before even doing the test drive. To be honest we would have walked away anytime throughout the process since we were in no hurry to buy. Kipp gave us our space but yet was there to answer any of my MANY MANY questions. We ended up purchasing the truck about a week later at a price we felt very comfortable with. Before leaving the dealership that day, Eric was there to make sure we knew how to use all the features offered and help us to get our Onstar set up properly. We left that day knowing without a doubt that we made a great decision! Everyone in the dealership was very professional and friendly. Since that day, we have been and will continue to recommend them. Thank you so much Kipp and Eric for making what can be a very stressful time a pleasant one!

Every on was very helpful. Well trainer. Knew product.

Always quick and easy working with Jeremy Seep at Don Larson. We have gone there for years for all of our service needs as well and could not be happier with the service department - especially Vicki!

Very good service. I was greeted promptly, and my service request was already recorded. I went to the waiting room and was updated on my vehicle's service.

Salesman Adam was good 👍 thanks for a good ride i hope to see on my next buy

My Silverado started losing power while traveling from Illinois to Wausau last Friday night. Called Trecek in the morning. Got me in but were booked up and told me they couldn't probably look at my truck until Tuesday. Dropped it off and secured other transportation. While driving back to Illinois on Monday, got a call from Trecek. My truck was done. They had a cancellation and were able to bump me up and get it fixed (they knew I'd be passing by on my way home on Monday). So I was able to return the other car and not have to make another trip back up to pick up my truck. The repair was good, and they coordinated all with my warranty company as well. Travis in the service department was great.

Nice job. Service was done quickly and on time. We will have service done here again.

I?ve been to Tercek before and I will continue to use them.

Talk to Charles he’ll make your buying experience the best you’ve ever had! We never expected to end up in Berlin but so glad we did!

My family has bought 22 cars and trucks from WESTSIDE GM and Diane Grant-Simenson over the last 30 years. Kudos to DIANE for her 30 years of selling our family so many vehicles!