Some buyers walk onto an Ohio truck lot knowing exactly what they need — and it is not a half-ton. They tow a fifth-wheel to Hocking Hills, haul a skid-steer outside Columbus, or pull a horse trailer down I-71 in January. For them, the question is never whether to buy a heavy-duty truck — it is which one. The two names that keep coming up are the 2025 Ram 2500 Laramie and the 2025 GMC Sierra 2500HD SLT.
Both sit in the same sweet spot of the heavy-duty market: a step above the work-truck trims, leather inside, real tech on the dash, and a price starting in the mid-$60,000s. Both offer a gas V8 and a big diesel. Yet they go about the job differently: the Ram leans on a brand-new Cummins diesel and a coil-spring rear suspension that rides like no other HD truck; the GMC answers with the strongest diesel horsepower in the class and a trailering camera system that borders on cheating. Short version: if maximum diesel muscle and trailering tech decide it, take the Sierra; if ride comfort and the strongest low-end pull matter more, take the Ram.
Quick Verdict
| Category | Winner | Why |
| Diesel power | GMC Sierra 2500HD SLT | 470 hp Duramax vs 430 hp Cummins |
| Diesel torque | Ram 2500 Laramie | 1,075 lb-ft Cummins vs 975 lb-ft Duramax |
| Max towing | GMC Sierra 2500HD SLT | 21,870 lbs gooseneck (crew cab) vs 20,000 lbs |
| Max payload | Ram 2500 Laramie | Up to 4,440 lbs vs up to 4,049 lbs |
| Ride comfort | Ram 2500 Laramie | Coil-spring rear suspension |
| Cabin technology | GMC Sierra 2500HD SLT | Bigger screen, Google built-in, up to 14 camera views |
| Trailering tech | GMC Sierra 2500HD SLT | ProGrade system with Transparent Trailer View |
| Value | Tie | Both start near $63,000–$67,000; the diesel option decides the bill |
At a Glance
| Spec | 2025 Ram 2500 Laramie | 2025 GMC Sierra 2500HD SLT |
| Standard engine | 6.4L HEMI V8 | 6.6L V8 gas |
| Standard power | 405 hp / 429 lb-ft | 401 hp / 464 lb-ft |
| Optional diesel | 6.7L Cummins HO I6 | 6.6L Duramax Turbo-Diesel V8 |
| Diesel power | 430 hp / 1,075 lb-ft | 470 hp / 975 lb-ft |
| Transmission | 8-speed TorqueFlite HD automatic | 10-speed Allison automatic |
| Drivetrain | 4WD (2WD available) | 4WD (2WD available) |
| Max towing (diesel) | 20,000 lbs | 21,870 lbs (gooseneck, crew cab) |
| Max towing (gas) | 17,750 lbs | 18,500 lbs |
| Max payload | Up to 4,440 lbs | Up to 4,049 lbs |
| Fuel economy | Not EPA-rated (HD trucks exempt) | Not EPA-rated (HD trucks exempt) |
| Starting price | From ~$62,695 (Crew Cab 2WD) | From $66,895 |
| Diesel option | $12,595 | Optional (priced by configuration) |
| Destination charge | $2,095 | $1,995 |
Design & Exterior
The 2025 Ram 2500 Laramie wears the refreshed face Ram gave the whole HD line for 2025 — a bolder grille, slimmer LED headlights, and cleaner sheet metal. The Laramie is the handsome one of the lineup, chrome used sparingly.
The Sierra 2500HD SLT takes a different route to the same destination. GMC's design language has always been more architectural — C-shaped LED running lights, a tall upright grille, and body lines that look carved rather than stamped. The SLT adds chrome bumpers, LED fog lamps, and 18-inch wheels.
Under the skin, the Ram's party trick is one you cannot see: a coil-spring rear suspension, unique in the heavy-duty class. Every other HD pickup, the Sierra included, uses traditional leaf springs at the back. The coils do not change what the Ram can tow, but they change how it behaves with an empty bed. The Sierra counters with its available six-function MultiPro tailgate, which doubles as a step, a load stop, and a work surface. A 6-foot-4-inch short bed is standard on Crew Cabs, with an 8-foot bed available.
Interior, Comfort & Technology
Step inside the Ram 2500 Laramie and the first thing that hits you is how quiet and finished the cabin feels. Leather-trimmed bucket seats, heated up front, come standard, with a heated steering wheel and dual-zone climate control. The seats are wide and generously cushioned, and the rear Crew Cab bench fits three adults without negotiation. Storage is everywhere: a full-length floor console and rear under-seat bins.
The Ram's tech story centers on Uconnect 5, served up on a standard 12.0-inch touchscreen with wireless Apple CarPlay and Android Auto, navigation, and SiriusXM 360L. An available 14.5-inch display and an optional 10.25-inch passenger display are offered. A 12-inch digital cluster is standard, and the nine-speaker Alpine audio is genuinely good; the optional 17-speaker Harman Kardon setup is better still.
The Sierra SLT's cabin feels more like a control room. The centerpiece is a 13.4-inch GMC Premium Infotainment touchscreen with Google built-in, paired with a 12.3-inch digital Driver Information Center. The SLT adds 10-way power heated front seats with lumbar support and a heated steering wheel, and perforated leather heated and ventilated bucket seats, Bose premium audio, and a head-up display are available.
The Sierra Crew Cab claims best-in-class front head and leg room, and it shows. For a ten-hour tow day, the Ram wins on seat comfort; to run a job site from, the GMC's bigger screens edge ahead.
Performance & Driving Feel
The engine choice is where this comparison gets interesting: both trucks offer two engines, and the right answer depends entirely on what you tow.
Start with gas. The Ram's standard 6.4-liter HEMI V8 makes 405 horsepower and 429 lb-ft of torque; the GMC's standard 6.6-liter V8 makes 401 horsepower and 464 lb-ft. On paper, that is a wash. Both are honest, hard-working motors that tow up to 17,750 pounds (Ram) or 18,500 pounds (GMC). If your trailer stays under 12,000 pounds and the truck doubles as a daily driver, either gas engine saves roughly $10,000-plus over the diesel and is the smart buy.
The diesels are another story. Ram's 2025 Cummins is a substantially revised 6.7-liter inline-six, now offered in a single high-output tune: 430 horsepower and a class-leading 1,075 lb-ft of torque. The old 370-horsepower standard-output Cummins is gone. That torque is the headline number here: it lets the Ram launch a loaded gooseneck from a dead stop without drama, and the diesel hits 60 mph in about 6.9 seconds.
GMC's Duramax counters with 470 horsepower and 975 lb-ft from its 6.6-liter turbo-diesel V8 — the most horsepower in the class. The Ram's extra 100 lb-ft matters more at launch and on grades; the GMC's extra 40 hp matters more at speed. Both pair with excellent transmissions: a new 8-speed TorqueFlite HD in the Ram, a proven 10-speed Allison in the GMC.
On the road, the Ram's coil springs are the difference you feel first. Unloaded, the Ram rides like a truck a full class smaller — composed over broken Ohio pavement and free of the empty-bed hop. The Sierra rides like a proper heavy-duty truck: firm, controlled, and honest about its payload mission. The Ram's diesel exhaust brake is a standout on long downhill grades. Buy the Ram if you drive it empty a lot; buy the GMC if the trailer is always attached.
Fuel Economy & Real-World Range
The EPA does not rate heavy-duty trucks for fuel economy, so there are no official MPG numbers for either truck.
In real-world testing, a diesel Ram 2500 returned around 25 mpg on the highway and high-teens in mixed driving unloaded; work it hard with a trailer and those numbers fall by a third or more. The GMC's Duramax behaves similarly: low-20s on the highway unloaded, mid-teens while towing. Both carry large fuel tanks — about 31 gallons in the Ram Crew Cab, 36 in the GMC — so a diesel in either truck can cover 500-plus highway miles between fill-ups.
Towing & Payload
This is why these trucks exist. Properly equipped, the 2025 Ram 2500 Laramie tows up to 20,000 pounds with the Cummins diesel and a fifth-wheel or gooseneck setup, and 17,750 pounds with the HEMI V8. Maximum payload runs up to 4,440 pounds. The Cummins option costs $12,595 — the most consequential checkbox on the Ram's order sheet, buying 2,250 pounds of extra towing and 646 lb-ft of extra torque.
The 2025 Sierra 2500HD SLT tows up to 21,870 pounds with a gooseneck or fifth-wheel hitch in Crew Cab diesel form, and up to 20,000 pounds conventionally; the gas truck tops out at 18,500 pounds, with maximum payload up to 4,049 pounds. So the GMC tows more at the top end, while the Ram carries more in the bed. A fifth-wheel camper favors the GMC; a bed full of masonry or a slide-in camper favors the Ram.
Both trucks bring serious trailering technology. The Ram offers blind-spot monitoring with trailer detection, a trailer brake controller, a 360-degree surround-view camera system, and a bed camera. The GMC's ProGrade Trailering System is the class benchmark: an in-vehicle trailering app with profiles and checklists, and up to 14 camera views including the industry-first Transparent Trailer View, which makes the trailer effectively disappear on screen.
Safety & Driver Assistance
Both deliver strong safety equipment as standard. The Ram 2500 Laramie comes with adaptive cruise control, forward collision warning with active braking, blind-spot monitoring with trailer detection, lane-keeping assist, ParkSense park assist, drowsy driver detection, and traffic sign recognition. The 2025 Ram 2500 earned a four-star overall safety rating from NHTSA.
The GMC answers with Sierra HD Pro Safety, standard on every trim: Forward Collision Alert, Automatic Emergency Braking, Front Pedestrian Braking, Lane Departure Warning, IntelliBeam high beams, a Following Distance Indicator, and Buckle to Drive. Available upgrades include Rear Cross Traffic Alert and Trailer Side Blind Zone Alert, which extends blind-spot coverage to the trailer's length.
Pricing, Trims & Value
The 2025 Ram 2500 Laramie starts in the low-$60,000s: about $62,695 for a Crew Cab 2WD, around $66,525 for the 4x4 most Ohio buyers will choose, plus $2,095 destination. The Cummins adds $12,595, pushing a well-equipped diesel 4x4 into the high-$70,000s.
The 2025 GMC Sierra 2500HD SLT starts at $66,895, plus $1,995 destination. The Duramax is optional and priced by configuration; a diesel SLT Crew Cab 4x4 with the trailering packages most buyers want lands in the mid-to-high-$70,000s, with loaded examples crossing $80,000.
If you want the biggest screen, the best trailering cameras, and the most diesel horsepower, the GMC gives you more. If you want the most torque, the best ride, and the strongest payload rating, the Ram does. Both carry a five-year, 100,000-mile powertrain warranty over a three-year, 36,000-mile basic warranty, and three-quarter-ton diesels hold their value better than almost anything else with four wheels.
Pros and Cons
2025 Ram 2500 Laramie
Pros: Class-leading 1,075 lb-ft of Cummins torque; best ride in the class from the coil-spring rear suspension; highest payload here at up to 4,440 lbs; revised Cummins and new 8-speed; superb cabin comfort.
Cons: Lower max towing than the GMC (20,000 vs 21,870 lbs gooseneck); diesel is a steep $12,595; trailering cameras trail the GMC's ProGrade setup; the 14.5-inch screen costs extra.
2025 GMC Sierra 2500HD SLT
Pros: Class-leading 470 hp Duramax; highest towing here at 21,870 lbs (gooseneck, crew cab); ProGrade Trailering with Transparent Trailer View is the best in the segment; 13.4-inch touchscreen with Google built-in; available Trailer Side Blind Zone Alert; MultiPro tailgate.
Cons: 100 lb-ft less diesel torque; leaf-spring rear rides firmer unloaded; lower max payload (up to 4,049 lbs); SLT starts a few thousand higher.
Who Should Buy Which?
Buy the Ram 2500 Laramie if you tow a heavy fifth-wheel and care about launch torque; if your truck spends much of its miles with an empty bed and you want the most comfortable ride a heavy-duty truck can offer; or if you load the bed heavy and want the higher payload ceiling.
Buy the GMC Sierra 2500HD SLT if you tow the biggest trailers and want the highest gooseneck rating in this pair; if trailering tech is a priority and the Transparent Trailer View and ProGrade app sound like things you would use every weekend; or if the bigger standard screen and Google built-in matter more than the Ram's seat comfort.
Buy the gas engine in either truck if your trailer stays under roughly 12,000 pounds; buy the diesel if you tow heavy, tow far, or plan to keep the truck long enough for resale to pay you back.
Final Verdict
There is no wrong answer here: the Ram 2500 Laramie is the more comfortable truck, the stronger puller at low speed, and the better bed-hauler, while the Sierra 2500HD SLT is the more powerful truck at speed, the stronger tower at the top end, and the smarter trailering tool.
If we had to pick one truck to live with for five years of Ohio winters, job sites, and summer camping trips, we would take home the Ram 2500 Laramie with the Cummins diesel — easier to live with on the 300 days a year you are not towing at maximum capacity. But if your weekends are defined by the biggest fifth-wheel you can legally pull, the Sierra's extra towing capacity and camera system are hard to argue against. Drive both, hitch your trailer to both, and let the trailer decide.
For more heavy-duty comparisons, see our Ram 2500 Power Wagon vs Ford Super Duty Tremor showdown, our Ford Super Duty Platinum vs GMC Sierra HD Denali Ultimate luxury HD battle, and our Ram 1500 Tungsten vs Ford F-150 King Ranch western luxury truck head-to-head.
Frequently Asked Questions
Which truck tows more, the 2025 Ram 2500 Laramie or the 2025 GMC Sierra 2500HD SLT? The GMC: up to 21,870 pounds with a gooseneck or fifth-wheel hitch in Crew Cab diesel form, versus 20,000 pounds for the diesel Ram.
Which diesel is stronger, Cummins or Duramax? The Ram's Cummins makes 430 hp and a class-leading 1,075 lb-ft; the GMC's Duramax makes a class-leading 470 hp and 975 lb-ft. The Ram pulls harder from a stop and on steep grades; the GMC pulls harder at highway speed.
How much does a 2025 Ram 2500 Laramie cost? About $62,695 for a Crew Cab 2WD and around $66,525 for a 4x4, plus $2,095 destination. The Cummins adds $12,595; a well-equipped diesel 4x4 typically lands in the high-$70,000s.
How much does a 2025 GMC Sierra 2500HD SLT cost? The SLT starts at $66,895 plus $1,995 destination. The Duramax is optional and priced by configuration; a diesel SLT 4x4 with popular trailering packages typically lands in the mid-to-high-$70,000s.
Do heavy-duty trucks have EPA fuel economy ratings? No — the EPA does not rate heavy-duty trucks (over 8,500 pounds GVWR). A diesel Ram 2500 returned around 25 mpg on the highway unloaded in real-world testing; expect low-20s from the Duramax, and mid-teens from either truck while towing.
Is the Ram 2500 Laramie a good daily driver? Yes — better than any other HD truck, thanks to its coil-spring rear suspension, which smooths out the empty-bed ride. It is still a very large truck to park, but it is the most comfortable choice here.
— Stefany Aurora, ABBOhio Editorial
