"Text 815-446-7319 for questions or to schedule a test drive. Text questions directly to sales at (815) 446-7319. ""Experience the Arnie Bauer Advantage: Trusted Family-Owned Values Since 1945."" At Arnie Bauer, we believe in empowering our customers with transparent pricing, exceptional service, and unmatched peace of mind. As a family-owned and operated dealership since 1945, we take pride in treating our customers like family, ensuring you receive the care and attention you deserve. Enjoy the confidence of our free lifetime engine warranty and trust that we never engage in price gouging, providing you with the best value for your hard-earned dollar. With two convenient locations, your journey to a new vehicle is not just a transactionit's a relationship built on trust and satisfaction. At Arnie Bauer, your dollar has more power. Take on any job, trail, or adventure in this bold and capable 2026 GMC Sierra 2500HD AT4X for sale at Arnie Bauer GMC in Wilmington, IL. Finished in stunning Summit White with a premium Obsidian Rush interior, this heavy-duty GMC truck combines luxury, off-road capability, and diesel-powered performance into one exceptional package. Powered by the legendary Duramax 6.6L Turbo-Diesel V8 engine paired with the Allison 10-speed automatic transmission, this 4WD Sierra 2500HD AT4X delivers incredible towing capability, impressive torque, and smooth power delivery for work or play. Whether youre towing heavy equipment around Illinois or heading off-road for weekend adventures, the Sierra AT4X is built to handle it all with confidence. This 2026 GMC Sierra 2500HD AT4X includes premium features and advanced technology designed for comfort, safety, and convenience, including: AT4X Off-Road Suspension Package Adaptive Cruise Control Heated and Ventilated Front Seats Front Seat Massage Function Heated Rear Seats Power Sunroof Bose 12-Speaker Premium Audio System 13.4 GMC Premium Infotainment Touchscreen MultiPro Tailgate HD Surround Vision Camera System Trailer Camera Provisions Gooseneck / 5th Wheel Prep Package Power Retractable Assist Steps with LED Lighting Wireless Apple CarPlay & Android Auto Head-Up Display Heated Steering Wheel Spray-On Bedliner Red Recovery Hooks LED Projector Headlamps MultiPro Audio System by KICKER® Drivers searching for a diesel truck near Wilmington, Joliet, Morris, Bourbonnais, or the surrounding Illinois areas will appreciate the Sierra 2500HD AT4Xs premium interior, aggressive styling, and advanced trailering technology. The Summit White exterior paired with gloss black accents and rugged AT4X styling gives this GMC HD truck a commanding presence on the road. If you are looking for a new GMC Sierra 2500HD AT4X in Wilmington, IL, visit Arnie Bauer GMC today to explore this incredible heavy-duty pickup in person. Our team is here to help with financing, trade-ins, online shopping, and nationwide vehicle delivery options. Shop Arnie Bauer GMC in Wilmington, IL today and experience the power, luxury, and capability of the 2026 GMC Sierra 2500HD AT4X."