2018 Ram 1500 Towing and Payload Specs: Coil vs. Air Suspension Analysis for Maximum Capability
You’re hooked up to a 9,000-pound trailer, and as you pull away from the curb, you feel the rear end squat—but then something magical happens: the truck levels itself, and you forget the trailer is even back there.
That’s the promise of the 2018 Ram 1500’s available air suspension. But here’s the question every Ram buyer needs answered before signing the paperwork: does air suspension actually improve your towing experience, or does it just add complexity and cost? And how do the numbers stack up against the standard coil spring setup?
This guide breaks down the engineering, the specifications, and the real-world tradeoffs between coil springs and air suspension on the 2018 Ram 1500. We’ll look at payload capacities, towing maximums, ride quality differences, and—most importantly—which configuration actually works better for your specific towing needs.
TL;DR
The 2018 Ram 1500 offers two distinct rear suspension systems: standard five-link coil springs and optional Active-Level Four Corner Air Suspension. The coils handle up to 1,510 pounds of payload and 10,140 pounds of towing in optimal configurations . The air suspension offers automatic load leveling, five adjustable ride heights, and improved aerodynamics—but maximum towing and payload figures remain virtually identical between the two systems. The real difference is in the driving experience: coils provide consistent, predictable handling, while air suspension delivers a smoother unloaded ride and automatic leveling under load. However, the air system adds complexity and potential repair costs down the road .
Key Takeaways
- Maximum Towing: Properly equipped 2018 Ram 1500 with 5.7L Hemi and 3.92 gears can tow up to 10,140 lbs—identical for both coil and air suspension .
- Maximum Payload: Crew cab models max out at 1,510 lbs regardless of suspension type .
- Air Suspension Cost: The optional four-corner air suspension added $1,715 to the MSRP when new .
- Ride Height Adjustments: Air suspension offers five settings—Entry/Exit, Aero, Normal, Off-Road 1, and Off-Road 2—ranging from 4.5 inches lower to 2 inches higher than standard ride height.
- The Coil Advantage: Simpler, more reliable, and easier to upgrade with aftermarket heavy-duty springs if you regularly exceed factory payload ratings .
- The Air Advantage: Automatic load leveling maintains proper headlight aim and handling regardless of trailer tongue weight .
- Safety Reminder: Always check your owner’s manual for the proper weight distribution hitch setup procedure—especially with air suspension equipped trucks .
Understanding the 2018 Ram 1500 Suspension Systems
Before we dive into the numbers, you need to understand what’s happening under your truck. The 2018 Ram 1500 rides on a fully boxed frame with an independent front suspension and a unique rear five-link setup with coil springs . This was revolutionary when Ram first introduced it because every other half-ton pickup at the time used leaf springs.
The Standard Coil Spring Setup
Ram’s five-link rear suspension with coil springs is the foundation. It’s elegant in its simplicity: five locating rods position the rear axle precisely, while coil springs carry the weight. This design allows for better axle articulation off-road and a smoother ride when empty compared to leaf springs .
The coils themselves are progressive rate, meaning they get stiffer as they compress. This gives you a compliant ride when the bed is empty but enough support when you load up. For most owners, this system works perfectly and will go hundreds of thousands of miles without issue.
The Active-Level Four Corner Air Suspension Option
Here’s where things get interesting. Ram’s optional air suspension replaces the coil springs at all four corners with air bags . An onboard compressor, reservoir tank, and control module let you adjust ride height on the fly.
The five height settings are:
| Mode | Height Change | When It’s Used |
|---|---|---|
| Entry/Exit | Lowers 2 inches | Getting in/out, loading cargo |
| Aero | Lowers 0.6 inches | Highway cruising for fuel economy |
| Normal Ride Height | Baseline | Everyday driving |
| Off-Road 1 | Raises 1.2 inches | Rough terrain, deep snow |
| Off-Road 2 | Raises 2.0 inches | Extreme off-road clearance |
The system automatically selects the appropriate height based on speed and driving conditions. At highway speeds, it drops into Aero mode to reduce drag and improve fuel economy . When you’re parked, you can lower the truck for easier access.
Towing and Payload Specifications: The Numbers That Matter
Here’s the truth that might surprise you: the maximum towing and payload ratings are virtually identical between coil and air suspension trucks .
The 2018 Ram 1500’s capabilities depend far more on:
- Engine choice (3.6L V6, 5.7L Hemi, or 3.0L EcoDiesel)
- Axle ratio (3.21 or 3.92)
- Cab configuration (Regular, Quad, or Crew)
- Drive type (2WD or 4WD)
Maximum Capability by Configuration
The 5.7L Hemi V8 (395 hp, 410 lb-ft):
- Best towing: 10,140 lbs with Crew Cab, 3.92 gears, and proper equipment
- Best payload: 1,510 lbs depending on configuration
The 3.0L EcoDiesel V6 (240 hp, 420 lb-ft):
- Best towing: Approximately 9,200 lbs
- Best payload: Similar to Hemi configurations
- Fuel economy: Up to 29 mpg highway in HFE trim
The 3.6L Pentastar V6 (305 hp, 269 lb-ft):
- Best towing: Approximately 7,600 lbs
- Best for: Daily driving, occasional light towing
Why the Numbers Stay the Same
You might wonder: if air suspension can level the load automatically, why doesn’t it increase the rated capacity?
The answer comes down to what limits a truck’s capabilities. Towing and payload ratings are determined by:
- Frame strength (identical regardless of suspension)
- Axle capacity (identical regardless of suspension)
- Brake system (identical regardless of suspension)
- Cooling capacity (identical regardless of suspension)
The suspension itself—whether coils or air bags—is designed to handle the same maximum loads. The air system’s advantage isn’t higher capacity; it’s better behavior at that capacity .
Visualizing the Towing Capability Spread
Here’s a chart showing how the 2018 Ram 1500’s towing capacity varies by configuration:
Note: These figures represent properly equipped configurations. Always verify your specific vehicle’s door jamb sticker.
Real-World Impact: How Each Suspension Behaves Under Load
This is where the rubber meets the road—literally. The numbers on paper only tell part of the story. Here’s what you actually experience towing with each system.
Towing with Coil Springs
The standard coil spring setup is predictable and consistent. When you hook up a trailer, the rear compresses based on tongue weight. A 500-pound tongue weight might drop the rear 2 inches. An 800-pound tongue weight might drop it 3.5 inches.
The pros of towing with coils:
- Consistent feel—you learn exactly how the truck responds
- No electronics to fail
- Easy to upgrade with heavier springs if you need more capacity
The cons:
- Headlight aim changes with load (you may need to manually adjust or use load-leveling hitches)
- The truck squats visibly, which can affect departure angles
- Ride quality degrades with heavy tongue weights
If you regularly approach maximum payload, aftermarket options like SuperSprings SuperCoils (Part # SSC-50) can increase capacity by roughly 50% while maintaining stock ride height . These are direct replacements for the factory coils and take about 1-2 hours to install.
Towing with Air Suspension
This is where the air system earns its keep. The moment you hook up a heavy trailer, the air suspension senses the load and compensates. Within seconds, the rear rises back to normal ride height, and the truck sits perfectly level .
The pros of towing with air:
- Automatic load leveling—the truck always sits level regardless of tongue weight
- Maintained headlight aim (safer for oncoming traffic)
- Five ride height settings let you optimize for different conditions
- Better aerodynamics at highway speed (Aero mode)
The cons:
- More complex system with potential failure points
- Some reviewers note that air suspension can feel slightly less composed when towing heavy loads compared to properly rated coils
- Repairs are expensive when components fail
- Not as easily upgraded for extreme loads
The Official Procedure for Towing with Air Suspension
According to the 2018 Ram 1500 owner’s manual, there’s a specific process for setting up a weight-distributing hitch on air suspension trucks :
- Position the truck without connecting the trailer
- Measure front fender height (H1)
- Attach the trailer without weight distribution bars
- Measure front fender height again (H2)
- Adjust weight distribution bars until front height reaches (H2-H1)/2 + H1
The manual notes that Normal Ride Height or Alternate Trailer Height can be used, but the vehicle must remain running while attaching a trailer for proper leveling .
Note: The owner’s manual specifically warns that it may not be possible to enter Alternate Trailer Height while lightly loaded .
Which Suspension Is Right for You?
This decision comes down to how you use your truck.
Choose Coil Springs If:
- You plan to keep the truck long-term (simpler system, fewer expensive repairs)
- You regularly exceed factory payload ratings (aftermarket heavy coils are available)
- You off-road hard (less electronics to worry about, simpler field repairs)
- Budget is a concern (no $1,715 upfront cost, no future air compressor replacements)
- You prefer predictable, mechanical feel (what you see is what you get)
Choose Air Suspension If:
- You tow frequently but with varying loads (automatic leveling is a game-changer)
- You value convenience and tech (the party trick of lowering the truck impresses passengers)
- You have mobility issues (Entry/Exit mode makes climbing in easier)
- You want the best possible unloaded ride (air suspension soaks up bumps beautifully)
- You’re leasing or plan to sell within warranty period (let someone else worry about long-term reliability)
Cost Considerations and Long-Term Ownership
Let’s talk money, because this matters.
Upfront Cost:
- Coil springs: standard equipment, no cost
- Air suspension: $1,715 option when new
Repair Costs:
- Replacement coil springs: $200–$400 for premium aftermarket sets
- Air suspension compressor failure: $800–$1,200 installed
- Air strut replacement: $600–$1,000 per corner
- Complete air system failure: $3,000–$5,000 at dealership prices
Aftermarket Upgrades:
If you have coil springs and need more capacity, companies like THOCAC and Misakomo offer heavy-duty replacement coils that increase load capacity by 35-50% for under $200 . These install in 1-2 hours with basic hand tools.
For air suspension owners, aftermarket support is more limited. When components fail, you’re largely at the mercy of dealership parts pricing.
Frequently Asked Questions
Does air suspension increase towing capacity on the 2018 Ram 1500?
No. Maximum towing capacity is determined by frame, axle, and cooling system ratings—not suspension type. A properly equipped coil spring truck can tow the same 10,140 lbs as an air suspension truck .
Can I add air suspension to my coil spring Ram?
Yes, but it’s expensive and complex. Aftermarket kits exist, but they typically cost $2,000–$4,000 installed. Most owners are better off with heavy-duty replacement coils if they need more capacity.
What happens if the air suspension fails while towing?
The system has a fail-safe mode. If the compressor dies, the truck will remain at the height it was last set to—it won’t suddenly drop. However, you’ll lose the ability to level or adjust height. You can still drive and tow, but the ride will be compromised until repairs are made.
How do I know if my 2018 Ram has air suspension?
Look for the ride height control switches near the gear selector. Also, listen for the compressor running after you park—the air system will occasionally adjust itself.
Is the air suspension reliable long-term?
This is debated. Some owners report 200,000+ trouble-free miles. Others experience compressor failures around 60,000–80,000 miles. The cold weather can stress the system, and moisture in the air lines can cause freezing in northern climates.
Can I tow a fifth-wheel or gooseneck with air suspension?
Yes, but you need to be careful. The air suspension will try to level the truck, which can change the trailer height relative to the hitch. Many fifth-wheel owners disable the auto-leveling feature when towing heavy.
What’s the best upgrade for towing with coil springs?
For moderate loads (under 1,000 lbs tongue weight), a good weight-distribution hitch is sufficient. For heavier loads or frequent towing, consider SuperSprings SuperCoils or similar heavy-duty replacement springs .
The Bottom Line
Here’s the thing about the 2018 Ram 1500’s suspension choices—neither is objectively better. They’re just different tools for different jobs.
The coil spring setup is the honest, hardworking choice. It’s simple, reliable, and easy to upgrade. It won’t impress your neighbors, but it’ll start every morning and ask for nothing in return.
The air suspension is the clever, sophisticated choice. It makes every drive more comfortable, automatically handles varying loads, and gives you party tricks like kneeling the truck for easy entry. But sophistication comes with complexity, and complexity comes with repair bills.
Ram trucks have become a benchmark for blending heavy-duty strength with everyday comfort. The suspension choice you make determines whether that comfort comes from elegant simplicity or advanced engineering.
If you’re buying a used 2018 Ram 1500 today, the decision might already be made for you—the truck either has air suspension or it doesn’t. But if you’re shopping and have a choice, think honestly about your needs. Do you tow the same trailer every weekend? Coils are fine. Do you tow different trailers, load the bed unevenly, and want the truck to always sit perfectly level? Air suspension is worth every penny.
What’s your experience towing with the 2018 Ram 1500? Do you prefer the simplicity of coils or the sophistication of air suspension? Drop your stories and questions in the comments below.
References:
- Edmunds: 2018 Ram 1500 Specs and Features
- Cars.com: 2018 Ram 1500 Overview and Review
- Amazon Canada: Heavy Duty Coil Spring Kits for Ram 1500
- Etrailer: SuperSprings SuperCoils Recommendation for Ram 1500
- Stellantis Media: 2018 Ram 1500 Official Fact Sheet
- 2018 Ram 1500 Owner’s Manual: Towing with Air Suspension
- Car Talk Community: Ram 1500 Towing Capacity Discussion
