How to Choose and Set Up Air Helper Springs for Towing
Air helper springs add support to your truck's existing suspension when a trailer or a loaded bed makes the rear end sag. Here's how to choose a kit that fits your exact truck, set the air pressure, and check the whole towing setup without going past your factory ratings.
Key Takeaways
| Question | Quick answer |
|---|---|
| What do air helper springs do? | They support the suspension under load and reduce squat and bottoming out. They do not raise your factory payload or towing ratings. |
| How do I find the right kit? | Match the kit to your exact model year, drivetrain, cab, bed, axle and suspension type. Start with our air suspension helper spring kits. |
| Air shocks or air bags for towing? | Air shocks combine damping and air support in one unit. Air bags are separate springs that work alongside your shocks. Choose the design built for your truck's suspension. |
| What pressure should I run when towing? | There is no single number. Stay inside the kit's minimum and maximum, and adjust with the load hooked up. |
| Do I need an onboard compressor? | No. Inflation valves work with any air compressor. An onboard system just makes frequent changes easier. |
| What if the truck still sags or sways? | Check trailer loading, tongue weight, hitch setup, tires and the rest of the suspension before adding more air. |
What air helper springs do when towing
Air helper springs sit between the frame and axle, or inside a coil spring, to help control sag under load. They work with the factory suspension. They don't replace your leaf springs, coils or shocks.
When towing, the extra support reduces rear-end squat and bottoming out, and brings headlight aim back to where it should be. A level truck is a good sign the load is supported, but it doesn't prove your steering, braking or trailer stability are right.
Air shocks and air bags do different jobs. Air shocks combine damping and air support in the shock absorber. Air bags are separate springs, so pick the design made for your truck's suspension and the support you need.
Air helper springs do not increase your truck's payload, axle ratings or towing capacity. Every kit maker says the same thing: never exceed your gross vehicle weight rating. Weigh the loaded axles and check the truck and trailer ratings before you head out, especially on winter roads.
Choose a spring design that matches the suspension
For a leaf spring rear, choose a kit engineered for your truck's frame, axle and leaf pack. Brackets are vehicle specific, so a kit for one truck won't bolt onto another.
For a coil spring suspension, use a helper designed to fit inside or work with the existing coil. A leaf spring kit is not a substitute because its mounts and layout are different.
Compare the kit's rated load-leveling capacity with what you actually carry, but never treat that number as permission to go past your factory ratings. Adjustable air springs suit loads that change from trip to trip.
Not every helper spring uses air. SuperSprings SumoSprings, like the SSR-610-47 for the Toyota Tundra, Tacoma and Nissan Titan and Frontier, are made from closed-cell microcellular urethane. They need no air lines, no compressor and no pressure checks, and they can't leak. The trade-off is that you can't adjust them for a changing load.
For the 2022 Toyota Tundra, the Air Lift 88383 LoadLifter 5000 Ultimate gives you adjustable support from 5 to 100 PSI and up to 5,000 lbs of load-leveling capacity. Its internal jounce bumper replaces the factory bumper and lets the springs run safely at zero air pressure. It doesn't fit 5th wheel hitches or trucks with factory air suspension.
For 2019 to 2022 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks, the no-drill Air Lift 57288 LoadLifter 5000 mounts to the rear leaf springs and adds up to 5,000 lbs of load-leveling capacity, adjustable from 5 to 100 PSI. It doesn't fit trucks with Adaptive Ride Control. Browse the full Air Lift lineup for other trucks.
Confirm fitment before choosing a kit
Make and model alone won't confirm fitment. Match the kit to the exact model year, drivetrain, cab, bed, axle and suspension type, because these change bracket placement, spring travel and clearance. Kits often exclude specific trims, like factory air suspension, adaptive damping or hybrid models.
Account for lift kits, aftermarket suspension parts and anything else that's been changed. Compare the kit's listed application with your truck, then check axle weights and ratings with the trailer and cargo loaded.
Air pressure can't fix an overloaded truck, an uneven trailer load or a poor hitch setup.
Firestone Ride-Rite kits are built for specific light trucks, vans and motorhomes. Each kit uses individual inflation valves so you can set pressure side to side or front to rear. Heavy-duty owners should look at the Firestone Ride-Rite 2890, an all-in-one kit for 4WD Ford F-250, F-350 and F-450 trucks that comes with a wireless compressor and no-drill mounting.
For Ram 1500 owners, the Air Lift 57365 LoadLifter 5000 fits the 2009 to 2010 Dodge Ram 1500, the 2011 to 2018 Ram 1500 and the 2019 to 2021 Ram 1500 Classic. It adds up to 5,000 lbs of load-leveling capacity, adjustable from 5 to 100 PSI, and doesn't fit trucks with factory air suspension.
Set air pressure for the load and ride
There is no universal towing pressure. Stay inside the kit's minimum and maximum, start at the minimum, then add air a little at a time with the load in place and recheck ride height and handling.
When you unhitch, drop back toward the minimum your kit calls for. Too much air makes the ride stiff. Too little can let a standard air spring bottom out or get damaged. Never run a standard air spring below its minimum pressure.
Separate left and right air lines let you adjust each side when the load creates a small side-to-side difference. Use that to fine-tune, not to hide a lopsided load. Move and secure the load first.
If you change pressure often, an onboard system saves you the trip to the air hose. The Air Lift WirelessAir 74000EZ controls each spring separately from a handheld remote or phone app and works with any brand of air spring. The Air Lift LoadController 25592 is a simpler single-path setup with a low pressure warning.
Plan installation and air controls
Install the brackets and springs following the kit instructions, then route the air lines away from exhaust heat, sharp edges, moving suspension parts and pinch points. Leave enough slack for full suspension travel so a line can't stretch, rub or get trapped.
Inflation valves are the simplest way to adjust pressure. A compressor isn't required, but it makes regular changes easier.
Use separate air lines when you need side-to-side adjustment. A shared line is simpler when your loads are usually balanced. If the suspension has been modified, access is tight, or you're not sure about routing and clearance, have a qualified installer do the work.
Our air bag suspension section brings together air spring kits, replacement springs, fittings and controls in one place.
Inspect the setup and check the whole towing combination
After installation, check the air lines, fittings, brackets and spring clearance through full suspension travel. Watch for pressure loss and leaks before putting the truck to work.
Repeat those checks after your first few trips and as part of regular maintenance, paying attention to fittings and anywhere a line could rub or get heat damaged. A small leak caught early is a cheap fix.
If the truck still sags or handles poorly, look at tongue weight, trailer loading, hitch setup, tires and the rest of the suspension before adding pressure. Air helper springs support the truck's suspension. They don't replace a weight distribution hitch or sway control when your truck and trailer need them.
Frequently Asked Questions
Do air helper springs help when carrying cargo in the bed, not just towing?
Yes. They support bed cargo the same way they support tongue weight. The combined load still counts toward your payload and axle limits, so place and secure cargo to avoid a rear-heavy setup.
Can I drive the truck if one air spring loses pressure?
It depends on the kit. Kits with an internal jounce bumper, like the Air Lift LoadLifter 5000 Ultimate, are rated to run at zero pressure. A standard air spring can be damaged if it collapses or rubs on nearby parts. Either way, stop towing, find the leak and restore support before you carry on with a load.
How often should I inspect air helper springs and lines?
Before a loaded trip, after the first few towing outings, and any time ride height or handling changes. Soapy water sprayed on the fittings will bubble where air is escaping.
Can air helper springs fix side-to-side lean from an uneven load?
Separate air lines let you run different pressure on each side for fine adjustment, but move and secure the load first. With a shared line, both springs get the same pressure and can't be adjusted independently.
Do air helper springs change wheel alignment?
They're not an alignment adjustment, but a big change in ride height can affect suspension geometry. If the truck tracks differently after install or its loaded ride height changes a lot, get the alignment checked.
Can I leave air helper springs installed when I'm not towing?
Yes. Leave them in and set the pressure for the load you're carrying, staying at or above the kit's minimum.
Conclusion
The right air helper springs match your exact truck and suspension, support the load within your factory ratings, and run at a pressure suited to the job. Set them up carefully, keep the air lines clear, and recheck the whole truck and trailer combination any time the ride height or handling changes.