2015 GMC Sierra 2500HD IV (GMTK2XX) Double Cab Standard Box Dimensions, Size & Specs

With the rear seats folded down, the 2015-2019 GMC Sierra 2500HD IV Double Cab Standard Box offers a cargo volume of 1728 liters (equivalent to about 61 cubic feet). This substantial luggage capacity allows for transporting bulky items or large loads, making it practical for work and recreational use that demands significant hauling space.

The curb weight of the GMC Sierra 2500HD IV Double Cab Standard Box falls between 2763 kg to 3317 kg (approximately 6093 to 7312 pounds). Its maximum permissible weight ranges from 4309 kg to 4536 kg (around 9499 to 10000 pounds), reflecting its heavy-duty construction designed to support demanding payloads and towing tasks typical of a 3/4-ton truck.

The GMC Sierra 2500HD IV Double Cab Standard Box has a ride height or ground clearance of 216 mm to 218 mm (approximately 8.5 to 8.6 inches). This level of clearance enhances the truck’s capability to navigate rough terrains and off-road conditions by allowing it to avoid obstacles and uneven surfaces without causing damage to the undercarriage.

This GMC Sierra 2500HD generation offers various rim sizes including 7.5J x 17, 8J x 18, 8.5J x 18.5, and 8.5J x 20 inches. The compatible tire sizes range from 245/75 R17 to 265/60 R20, with intermediate sizes like 265/70 R17, 265/70 R18, and 235/80 R17. These variations allow for customized handling characteristics and aesthetics depending on user preference and usage.

With its dimensions—5842 mm (230 inches) long, 2045 mm (80.5 inches) wide with mirrors extended, and about 1983-1984 mm (78 inches) tall—the GMC Sierra 2500HD IV Double Cab Standard Box is quite large. Most standard residential garages have door heights of around 2130 mm (84 inches) and widths of approximately 2440 mm (96 inches). While the height usually fits, the length and the width with mirrors open might require a larger or custom garage space. Careful measurement and possibly folding mirrors are advised to fit it safely indoors.

Compared to its predecessor (the third generation Sierra 2500HD), the 2015-2019 GMC Sierra 2500HD IV brings modest dimensional changes mostly aimed at improving capability and interior comfort. The fourth generation tends to be slightly longer and wider, with enhanced structural rigidity and modernized exterior dimensions optimized for better stability and load capacity. While the overall footprint is similar, the improvements reflect advancements in design, aerodynamics, and functionality for heavy-duty tasks.

When stacked against competitors like the Ford F-250 Super Duty or the Ram 2500, the GMC Sierra 2500HD IV Double Cab Standard Box is very competitive in size. All vehicles in this segment share large dimensions, with lengths around 5.8 to 6 meters (about 19 to 20 feet), widths near 2 meters (around 80 inches), and heights just below 2 meters (around 78 inches). The Sierra’s slightly narrower width with mirrors folded and similar length make it favorable for maneuverability, yet it doesn't compromise on cargo space or towing capability.

The Double Cab configuration of the 2015-2019 GMC Sierra 2500HD IV caters to five or six passengers comfortably, with two full-size front seats and a rear bench seat. Interior space focuses on practicality, balancing rear passenger legroom and cargo bed length (standard box). Although not as spacious as the Crew Cab variant, the Double Cab design optimizes the overall vehicle length, offering a versatile solution for both passenger transport and work utility.

The GMC Sierra 2500HD IV is engineered for demanding workloads such as towing, hauling, and off-road use. Its heavy curb and maximum weights allow it to handle trailers, equipment, and materials typical in construction, agriculture, or recreational towing like boats and campers. Combined with powerful engine options available in this generation, it offers robust torque and towing capacity, comfortable cabin features, and durable chassis designed to endure sustained heavy-duty usage.