2008 GMC Sierra 1500 Denali Max Towing Capacity & Payload
Max Towing Capacity
8,400 lbs
Safe limit: 6,720 lbs (80% rule)
Max Payload
1,617 lbs
Often the real limiting factor
Fuel Economy
14.0 mpg
12 city / 18 hwy (EPA Est.)
The 2008 GMC Sierra 1500 Denali is rated to tow up to 8,400 lbs. For real-world towing, the practical limit is 6,720 lbs — that's 80% of max, giving you margin for hills, headwinds, and load variation. The payload rating of 1,617 lbs is the number to watch closely — once you add passengers, hitch weight, and gear, it fills faster than most people expect. With this setup, you're looking at most travel trailers and slide-in campers.
Recommended Equipment
Towing Gear for This Truck
Matched to this trim's Class III hitch class and 8,400 lb tow rating
Class III Hitch Receiver
Required for towing. 2" receiver is standard on tow-equipped models.
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Trailer Wiring Adapter
7-pin to 4-pin adapters for trailer brake lights and signals.
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Brake Controller
Required by law in most states for trailers over 3,000 lbs.
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Weight Distribution Hitch
Strongly recommended for trailers over 6,000 lbs to level the load and reduce sway.
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Full Data
Specifications
Towing & Capacity
Engine & Performance
Dimensions
SpecificationValueShopLearn More
Towing
Payload & Weight
Curb Weight
5,383 lbs
SpecificationValueShopLearn More
Engine
Horsepower
403 HP
Torque
417 lb-ft
Transmission
6-speed shiftable automatic
Drive Type
Fuel Type
Gasoline
Fuel Tank
26.0 gallons
Fuel Economy (EPA)
City12 mpg
Highway18 mpg
Combined14 mpg
SpecificationValueShopLearn More
Dimensions
Cab Typecrew
What Can I Tow?
RV Class Compatibility
Based on a safe tow limit of 6,720 lbs and 1,617 lb payload. Shows what % of each RV class in our database you can tow.
RV Type
Weight Range
Coverage
Status
Travel Trailers
Bumper Pull
1,100 – 89,950 lbs
Limited
Toy Haulers
5th / Bumper
1,300 – 112,250 lbs
Limited
Fifth Wheels
5th Wheel
1,176 – 24,000 lbs
Limited
Destination Trailers
Bumper Pull
9,800 – 16,500 lbs
Out of Range
⚠ Vehicle capacity only — does not include passengers, gear, or tongue weight. Run the full calculator →
Compare Configurations
Other 2008 GMC Sierra 1500 Trims
| Configuration | Max Towing | MPG | |
|---|---|---|---|
| 2026 GMC Sierra 1500 Elevation | 13,300 lbs | 19.0 mpg | View → |
| 2026 GMC Sierra 1500 SLT 4WD | 13,100 lbs | 17.0 mpg | View → |
| 2026 GMC Sierra 1500 SLT | 13,100 lbs | 17.0 mpg | View → |
| 2026 GMC Sierra 1500 Elevation | 13,100 lbs | 19.0 mpg | View → |
| 2026 GMC Sierra 1500 SLT 4WD | 13,000 lbs | 17.0 mpg | View → |
| 2026 GMC Sierra 1500 Elevation 4WD | 13,000 lbs | 18.0 mpg | View → |
| 2026 GMC Sierra 1500 SLE 4WD | 12,800 lbs | 18.0 mpg | View → |
| 2026 GMC Sierra 1500 Elevation 4WD | 12,800 lbs | 18.0 mpg | View → |
| 2026 GMC Sierra 1500 SLE 4WD | 12,400 lbs | 18.0 mpg | View → |
| 2026 GMC Sierra 1500 Elevation 4WD | 12,400 lbs | 18.0 mpg | View → |
Questions & Answers
Common Questions
How much can I actually tow with my 2008 GMC Sierra 1500 Denali?
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The 2008 GMC Sierra 1500 Denali is rated at 8,400 lbs maximum — but the real-world best practice is the 80% rule: target 6,720 lbs as your practical limit. This gives you margin for hills, headwinds, braking distance, and real-world load variance. More critically, check your payload first — the door sticker tells you your specific truck's limit, and payload may be your actual binding constraint.
What about payload — how much stuff can I put in the truck?
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You have 1,617 lbs of payload capacity — that's everything going IN the truck: passengers (~150 lbs each), camping gear, coolers, and critically the tongue weight from your trailer. For bumper pull trailers, tongue weight is typically 10–15% of the trailer's loaded weight. It fills up faster than most people expect, especially on longer trips.
What kind of hitch do I need?
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For the 2008 GMC Sierra 1500 Denali, you need a Class III receiver hitch rated for 8,400 lbs. Don't skimp here — the hitch is the critical link between truck and trailer. For fifth wheel towing, you'll need a dedicated kingpin-style fifth wheel hitch mounted in the truck bed.
What types of RVs will work with my truck?
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With your 6,720 lb safe towing capacity, you're looking at most travel trailers and slide-in campers. The compatibility chart above shows what percentage of each RV class in our database you can handle. Use the Tow Calculator to check a specific RV including gear, water, and passengers.
What does GVWR mean and why should I care?
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GVWR is Gross Vehicle Weight Rating — the maximum your truck can weigh when fully loaded with people, gear, and fuel. Your truck's GVWR is 7,000 lbs. Exceed it and you're over-stressing brakes, suspension, and tires. This is different from towing capacity — it's about what the truck itself can carry.
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