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

The GMC Sierra 2500HD IV Double Cab Long Box measures 2045 mm (about 80.5 inches or 6 feet 8.5 inches) in width with the mirrors open. This width includes extended side mirrors necessary for better visibility when towing or hauling. While this width enhances safety by improving the driver’s field of vision, it can affect maneuverability in tight urban spaces or narrow lanes. The expanded width exceeds many standard vehicle width norms, so extra care is needed when parking or navigating narrow roads. However, the width is typical for heavy-duty pickups designed for demanding work tasks.

The vehicle height ranges between 1977 mm and 1978 mm (approximately 6 feet 6 inches). This relatively tall height is typical for heavy-duty pickups, accommodating large wheels, suspension components, and offering higher ground clearance. Because standard residential garages usually have heights between 2130 mm (7 feet) and 2440 mm (8 feet), the Sierra 2500HD IV Double Cab Long Box fits comfortably within most garages vertically. However, aftermarket accessories such as roof racks or lights could increase height beyond normal limits, so confirming exact clearance is advisable for storage or garage parking.

The curb weight of the 2015-2019 GMC Sierra 2500HD IV Double Cab Long Box ranges between 2812 kg to 3262 kg (6,200 to 7,195 pounds). The maximum gross vehicle weight rating (GVWR) is between 4309 kg and 4536 kg (9,500 to 10,000 pounds). These weight figures indicate the truck’s heavy-duty capacity, with the curb weight representing the truck's weight without cargo or passengers, and the maximum weight including payload and towing capacity. The heavy curb and GVWR values reflect the truck's ability to carry and tow substantial loads, supporting demanding work and commercial applications.

With the rear seats folded, the GMC Sierra 2500HD IV Double Cab Long Box offers approximately 2162 liters (about 76.3 cubic feet) of cargo capacity inside the cab area. This high volume of space is particularly useful for transporting tools, equipment, or other items securely inside the cabin when the rear seats are not in use. Combined with the long box bed, this configuration maximizes the vehicle's cargo versatility. The large interior cargo space, alongside exterior bed volume, makes this model highly practical for both professional tradespeople and outdoor activities requiring plentiful storage.

The GMC Sierra 2500HD IV Double Cab Long Box has a ground clearance between 214 mm and 216 mm (about 8.4 to 8.5 inches). This elevated ride height offers better capability for off-road driving and rough terrain. It prevents the undercarriage from scraping on obstacles, improving durability and versatility in work environments or outdoor situations. The ground clearance balances on-road stability with off-road readiness, which is particularly important for a heavy-duty pickup designed to handle towing, hauling, and varied road conditions.

The GMC Sierra 2500HD IV Double Cab Long Box comes with multiple rim sizes, including 7.5J x 17, 8J x 18, 8.5J x 18.5, 20 x 8.5 inches, providing a selection to suit different configurations and performance needs. Corresponding tires range across various sizes such as 245/75R17, 265/70R17, 265/70R18, 265/60R20, and others. These tire options influence ride comfort, handling, and load capacity, allowing buyers to customize the truck towards better towing, off-roading or everyday driving according to preference and requirement.

Yes, the 2015 GMC Sierra 2500HD IV Double Cab Long Box generally fits into a standard residential garage, but with some considerations. Most single-car garages offer a width of about 2.4 to 2.7 meters (8 to 9 feet), and the Sierra's width of 2.045 meters (6 feet 8.5 inches) with mirrors extended means that folding the mirrors is essential for garage entry. The height of approximately 1.978 meters (6 feet 6 inches) fits well below typical garage door heights exceeding 2 meters (6 feet 7 inches). Considering the length of about 6.32 meters (20 feet 9 inches), garage length must be sufficient, ideally 6.5 meters (around 21 feet) or longer, to comfortably fit the truck without obstructing the door or trimming the vehicle.

Compared to its predecessor, the GMC Sierra 2500HD III generation, the 2015-2019 Sierra 2500HD IV Double Cab Long Box introduced refined exterior dimensions with a slightly more aerodynamically sculpted body while maintaining a similar length (around 6.32 meters) and width. The newer generation generally offered improvements in interior space efficiency, updated technology, and enhanced towing capabilities, alongside revised suspension tuning for better ride comfort and load handling. Dimensionally, the height remained roughly equivalent near 1.98 meters, but technology upgrades and safety enhancements distinguished the 4th generation from the prior model, reflecting GMC’s role in modernizing its heavy-duty offerings.

The GMC Sierra 2500HD IV Double Cab Long Box closely matches competitors like the Ford F-250 and RAM 2500 in overall dimensions and capabilities. With a length of approximately 6.32 meters (20 feet 9 inches), a width around 2.045 meters (6 feet 8.5 inches with mirrors), and a height near 1.98 meters (6 feet 6 inches), it offers similar footprint and clearance as these rivals. Payload and towing capacities are competitive, with all trucks designed for demanding commercial and heavy-duty personal use. The Sierra’s interior cargo versatility and technology features give it an edge for buyers seeking a balance of ruggedness, comfort, and capability. Specific preferences may vary regarding engine options, ride quality, and feature availability.