2020 GMC Sierra 2500HD V (GMTT1XX) Double Cab Long Bed Dimensions, Size & Specs

The curb weight of the 2020 GMC Sierra 2500HD Double Cab Long Bed ranges between 2967 to 3505 kg (6544 to 7725 lbs), which represents the vehicle's weight without passengers or cargo but including necessary fluids and fuel. The maximum gross vehicle weight (GVWR) spans from 4627 to 5080 kg (10,200 to 11,200 lbs), which is the limit it can safely carry including its own weight, passengers, cargo, and trailer tongue weight. This high GVWR highlights the truck's heavy-duty purpose, making it suitable for demanding towing and hauling jobs. Buyers should consider these weights when planning payloads and ensure compliance with local regulations on vehicle loads.

The 2020 GMC Sierra 2500HD Double Cab Long Bed offers a ride height, or ground clearance, of 258 mm (10.2 inches). This elevated clearance is crucial for off-road capability, enabling the vehicle to traverse rough terrain, obstacles, and uneven ground without damaging the undercarriage. Furthermore, higher ground clearance aids in better visibility and vehicle control in various driving conditions. However, it may also affect entry and exit ease and vehicle stability when heavily loaded at high speeds.

The 2020 GMC Sierra 2500HD is fitted with various rim sizes including 7.5J x 17, 8J x 18, 8.5J x 18.5, and 8.5J x 20 inches, offering flexibility based on trim and preferences. Tire sizes available include 265/70 R17, 245/75 R17, 265/70 R18, 265/60 R20, and 275/70 R18. Larger rims and tires can enhance ground clearance and aesthetic appeal, while certain tire sizes provide improved traction and load capacity. Choosing the right tire and rim size affects ride comfort, fuel efficiency, off-road performance, and payload capabilities.

Standard residential garage door widths typically range from 2400 to 2700 mm (94.5 to 106.3 inches) and depths are usually around 6000 mm (236 inches). Given the GMC Sierra 2500HD Double Cab Long Bed's width of 2079 mm (81.8 inches) including mirrors and its impressively long length of 6514 mm (256.4 inches), it is extremely likely that the truck will fit width-wise into a standard garage with mirrors folded or removed, but its length may exceed typical garage depths. Many owners find that the truck fits if the garage is deeper than standard or if the garage is a detached or specialized larger space. Users should measure their garage carefully before parking this large pickup inside.

The long bed configuration of the GMC Sierra 2500HD Double Cab significantly enhances its cargo capacity by offering an extended bed length which is essential for hauling longer items like lumber, pipes, or large tools and equipment. This configuration makes it ideal for commercial use and heavy-duty hauling tasks. The larger bed length does impact overall vehicle length, which may reduce maneuverability in tight spaces and complicate parking. However, the tradeoff favors those who prioritize maximum load space and capability over compactness. The long bed combines well with the heavy-duty chassis and powerful engine setups of the 2020 model for excellent utility.

The 2020 GMC Sierra 2500HD GMTT1XX represents a notable step forward in design and engineering compared to its predecessor. Dimensionally, it maintains a similar long bed length and width, prioritizing hauling capability, though refinements in aerodynamics and styling give it a more modern appearance. Its curb weight and maximum weight tolerances have slightly increased due to added technology, safety features, and reinforcements that improve durability. The ride height remains optimized for heavy-duty off-road and towing needs. Overall, the 2020 generation offers enhanced powertrain options, better fuel efficiency, and upgraded suspension systems that improve both on-road comfort and off-road performance, setting it apart from its predecessor in functionality and driving experience.

When compared to similar heavy-duty pickups such as the Ford F-250 Super Duty and the Ram 2500, the 2020 GMC Sierra 2500HD Double Cab Long Bed holds its own with competitive dimensions and capabilities. Its length of 6514 mm (256.4 inches) and width with mirrors at 2079 mm (81.8 inches) are comparable to these rivals, placing it within the typical size range for heavy-duty pickups in this class. The curb weight (2967 to 3505 kg) and maximum weight capacity (4627 to 5080 kg) are also on par or slightly higher than some competitors, showing strong emphasis on hauling and towing. Unique GMC styling, advanced technology packages, and robust suspension tuning give the Sierra an edge for buyers prioritizing a premium experience alongside utility.

The Double Cab configuration of the 2020 GMC Sierra 2500HD balances passenger space and cargo capacity by offering additional rear seating behind the front seats. It provides reasonable legroom and headroom for adult passengers in the back, although it's less spacious than the Crew Cab variant, which has full-size rear doors and more rear passenger room. Interior materials and options focus on durability and comfort, including advanced infotainment, premium trims, and supportive seating. This cab style is well-suited for work crews or families needing extra seating without sacrificing a long bed for hauling.

Fuel efficiency in the 2020 GMC Sierra 2500HD Double Cab Long Bed is influenced by several key factors, including its heavy curb weight (up to 3505 kg/7725 lbs), large size (length over 6.5 meters), and powerful engine options designed for towing and hauling. Aerodynamics play a lesser role due to its boxy shape and height (2027 mm, 79.8 inches). Payload and trailer loads significantly affect fuel consumption as does tire size and rolling resistance. Additionally, driving habits and terrain contribute to overall economy. While the truck is optimized for capability, its fuel efficiency is naturally lower than lighter passenger trucks due to its heavy-duty purpose.