2021 Ram 2500 Lone Star 2dr Regular Cab LB (6.4L 8cyl 8A) Max Towing Capacity & Payload
Max Towing Capacity
0 lbs
Safe limit: 0 lbs (80% rule)
Max Payload
3,940 lbs
Often the real limiting factor
Fuel Economy
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See fuelly data below
The 2021 Ram 2500 Lone Star 2dr Regular Cab LB (6.4L 8cyl 8A) is rated to tow up to 0 lbs powered by the 6.4L. For real-world towing, the practical limit is 0 lbs — that's 80% of max, giving you margin for hills, headwinds, and load variation. The payload rating of 3,940 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 pop-up campers and smaller travel trailers.
Recommended Equipment
Towing Gear for This Truck
Matched to this trim's Class II hitch class and 0 lb tow rating
Class II 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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Trailer Wiring Adapter
7-pin to 4-pin adapters for brake lights and signals on lighter trailers.
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Full Data
Specifications
Towing & Capacity
Engine & Performance
Dimensions
SpecificationValueShopLearn More
Towing
Payload & Weight
Curb Weight
6,058 lbs
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Engine
Engine
6.4L
Horsepower
410 HP
Torque
429 lb-ft
Transmission
8-speed shiftable automatic
Drive Type
RWD
Fuel Type
Regular unleaded
SpecificationValueShopLearn More
Dimensions
Overall Length232.0"
Overall Width79.4"
Height78.0"
What Can I Tow?
RV Class Compatibility
Based on a safe tow limit of 0 lbs and 3,940 lb payload. Shows what % of each RV class in our database you can tow.
Use the tow calculator to find RVs that match your towing capacity.
Open Tow CalculatorCompare Configurations
Other 2021 Ram 2500 Trims
| Configuration | Max Towing | MPG | |
|---|---|---|---|
| 2024 Ram 2500 Tradesman RWD | 20,000 lbs | 13.6 mpg | View → |
| 2024 Ram 2500 Tradesman Fleet 4dr Crew Cab SB (6.4L 8cyl 8A) | 20,000 lbs | — | View → |
| 2024 Ram 2500 Tradesman 4dr Crew Cab LB (6.4L 8cyl 8A) | 20,000 lbs | — | View → |
| 2024 Ram 2500 Tradesman RWD | 19,990 lbs | 13.6 mpg | View → |
| 2024 Ram 2500 Tradesman 2dr Regular Cab LB (6.4L 8cyl 8A) | 19,990 lbs | — | View → |
| 2024 Ram 2500 Tradesman 4WD | 19,980 lbs | 13.6 mpg | View → |
| 2024 Ram 2500 Tradesman 2dr Regular Cab 4WD LB (6.4L 8cyl 8A) 4WD | 19,980 lbs | — | View → |
| 2024 Ram 2500 Tradesman 4WD | 18,230 lbs | 13.6 mpg | View → |
| 2024 Ram 2500 Tradesman 4dr Crew Cab 4WD LB (6.4L 8cyl 8A) 4WD | 18,230 lbs | — | View → |
| 2024 Ram 2500 Rebel 4WD | 16,870 lbs | 13.6 mpg | View → |
Questions & Answers
Common Questions
How much can I actually tow with my 2021 Ram 2500 Lone Star 2dr Regular Cab LB (6.4L 8cyl 8A)?
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The 2021 Ram 2500 Lone Star 2dr Regular Cab LB (6.4L 8cyl 8A) is rated at 0 lbs maximum — but the real-world best practice is the 80% rule: target 0 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 3,940 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 2021 Ram 2500 Lone Star 2dr Regular Cab LB (6.4L 8cyl 8A), you need a Class II receiver hitch rated for 0 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 0 lb safe towing capacity, you're looking at pop-up campers and smaller travel trailers. 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 0 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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