Towing with a Toyota HiLux shifts weight onto the rear axle, and the factory leaf springs sag once a loaded trailer or caravan goes on the tow ball. This guide ranks the load assist kit configurations that keep a HiLux level and stable for towing in 2026, matched to how the ute actually gets used rather than a single generic recommendation.
- Boss Extreme Series Load Assist Airbag Kit is the best overall load assist kit for HiLux towing in 2026.
- Tradies running constant heavy loads get more support from the Premium Heavy-Duty Load Assist Kit.
- Tourers who change loads often should pair a load assist kit with a Digital Air Controller.
- DIY fitters can avoid drilling into the chassis with a No-Drill Load Assist Kit on most HiLux variants.
- None of these kits increase a HiLux's legal GVM or towing capacity — they manage sag and stability within it.
Why this matters
A HiLux dual cab rides on leaf springs at the rear, and leaf springs are built to handle an unloaded tray comfortably rather than a loaded one. Add a caravan, a box trailer or a tray full of tools and the rear end drops, the headlights point skyward and the steering gets light. That's a stability problem before it's ever a comfort problem.
A load assist kit doesn't replace the leaf springs — it works with them. Airbags fitted either side of the rear axle add support that scales with air pressure, so the ute sits closer to level whether you're towing a van at 3,200kg or running empty back from the tip. Reading through how to choose the right load assist airbag kit before buying saves a return trip for the wrong bracket kit.
None of the configurations below increase a HiLux's legal GVM or towing capacity. They manage sag and stability inside the ratings the vehicle already has, which is the honest way to describe what a load assist kit does in 2026.
What makes the best load assist kit for a HiLux
- Fitment accuracy for the HiLux's factory leaf-spring rear end, by model year and cab style
- Bellow and bracket durability on corrugated roads and long towing runs
- Adjustable air pressure range wide enough to cover empty and loaded trips
- Compatibility with a digital controller, gauge or self-leveling valve if you want one later
- Installation method — bolt-on to existing mounts versus drilling into the chassis rail
- Warranty and local technical support if something needs checking after fitment
HiLux load assist kits at a glance
| Kit type | Best for | Standout feature | Key limitation |
|---|---|---|---|
| Boss Extreme Series Load Assist Airbag Kit | Everyday caravan and trailer towing | Double bellow airbags work with the factory leaf springs | Pressure needs manual adjustment for each load |
| Boss Premium Heavy-Duty Load Assist Kit | Tradies and constant heavy loads | Reinforced bellows built for sustained high pressure | More kit than needed for occasional towing |
| Load Assist Kit with Digital Air Controller | Touring with frequent ride-height changes | In-cab pressure adjustment, no crawling under the tray | Adds a second component to install and wire |
| No-Drill Load Assist Kit | Straightforward DIY fitment | Bolts to existing mounting points | Fewer bracket options on some HiLux model years |
| Load Assist Kit with Self-Leveling Valve | Set-and-forget load leveling | Adjusts pressure automatically as load changes | Less manual control over exact pressure at rest |
1. Boss Extreme Series Load Assist Airbag Kit: best load assist kit for everyday HiLux towing
The Boss Extreme Series Load Assist Airbag Kit uses two double-bellow airbags fitted either side of the rear axle, working with the HiLux's factory leaf springs rather than replacing them. Air pressure is adjusted through a valve at the rear to suit whatever load is on board that day. This is the standard configuration fitted to most late-model HiLux dual cabs used for towing a van or box trailer, and it's compatible with the leaf-spring ute air suspension kits category more broadly.
Boss Extreme Series Load Assist Airbag Kit pros:
- Works with the existing leaf-spring suspension, no spring removal needed
- Adjustable pressure to match an empty tray or a fully loaded one
- Reduces rear-end sag and helps keep headlights level when towing
Boss Extreme Series Load Assist Airbag Kit cons:
- Pressure needs manual adjustment each time the load changes
- Doesn't address front-end squat under heavy trailer braking
Best for: HiLux owners who tow a caravan, boat or box trailer on weekends and carry tools or gear through the week.
Verdict: Buy. This is the sensible default for most HiLux towing setups in 2026.
2. Boss Premium Heavy-Duty Load Assist Kit: best load assist kit for tradies carrying constant heavy loads
The Premium Heavy-Duty Load Assist Kit steps up the bellow construction for HiLux utes running a canopy, tray or slide-on camper that stays loaded most of the time. It still bolts onto the standard leaf-spring mounting points, but the airbags and brackets are built for sustained high pressure rather than occasional inflation.
Boss Premium Heavy-Duty Load Assist Kit pros:
- Handles continuous high pressure without the airbags working as hard
- Suited to fleet or work utes that rarely run empty
- Same bolt-on fitment as the standard kit
Boss Premium Heavy-Duty Load Assist Kit cons:
- More kit than needed if the HiLux only tows occasionally
- Firmer ride when the tray is empty, given the higher constant pressure
Best for: Tradies and fleet operators running a HiLux loaded most days, not just on tow weekends. Details on this configuration are covered in the premium heavy-duty airbag suspension kit guide.
Verdict: Buy for constant heavy loads — Skip if towing is occasional.
3. Load Assist Kit with Digital Air Controller: best setup for HiLux owners touring with changing loads
A digital air controller pairs with a load assist kit to move pressure adjustment into the cab. Instead of crawling under the tray with a hand pump, pressure gets set from a dash-mounted controller before hooking up the van or dropping the tailgate on a load of tools.
Digital Air Controller setup pros:
- Adjust pressure from the driver's seat, no crawling under the ute
- Useful when loads change several times between morning and evening
- Can show pressure on both sides for an uneven load
Digital Air Controller setup cons:
- Adds a second component to wire and mount
- Not necessary if pressure is set once and rarely changed
Best for: HiLux owners touring or working where the load changes several times a day.
Verdict: Buy if you adjust pressure often — Hold if you don't.
4. No-Drill Load Assist Kit: best load assist kit for straightforward DIY installation
Some HiLux load assist kits need brackets drilled into the chassis rail. The no-drill version uses the factory mounting points instead, which suits owners fitting the kit themselves in a home garage rather than booking a workshop.
No-Drill Load Assist Kit pros:
- Bolts to existing mounting points, no drilling into the chassis
- Shorter fitting time for a confident home mechanic
- No chassis modification to complicate warranty conversations later
No-Drill Load Assist Kit cons:
- Bracket options are more limited on some HiLux model years
- Still needs the vehicle-specific fitment guide checked before ordering
Best for: HiLux owners comfortable doing their own suspension work who'd rather avoid drilling.
Verdict: Buy for DIY fitment — Skip if you're not confident under the vehicle, and have a workshop fit it instead.
5. Load Assist Kit with Self-Leveling Valve: best load assist kit for set-and-forget load leveling
A self-leveling valve reads ride height at the rear axle and adjusts airbag pressure automatically as load comes on and off, rather than needing a manual top-up at the valve every time.
Self-Leveling Valve setup pros:
- Adjusts automatically as load changes, no manual pump-up
- Keeps ride height consistent without checking pressure each trip
- Reduces the chance of running underinflated straight after unloading
Self-Leveling Valve setup cons:
- Less manual control over exact pressure at rest
- Adds a component that needs periodic inspection like any valve
Best for: HiLux owners who'd rather the system manage pressure than check it themselves.
Verdict: Buy if you want a set-and-forget setup — Hold if you prefer manual control over exact pressure.
How we ranked
The order above weighs fitment accuracy against the HiLux's factory leaf-spring rear end first, then durability under Australian towing conditions, pressure adjustability, ease of installation and how well each configuration matches a specific use case. No configuration ranks higher for claiming to increase GVM or towing capacity — none of them do, and that distinction matters more than any spec sheet in 2026.
Which load assist kit should you choose for your HiLux?
If you're not sure where to start, the Boss Extreme Series Load Assist Airbag Kit is the right default for most HiLux owners towing a caravan or trailer in 2026. It works with the factory leaf springs, adjusts to whatever load is on board and doesn't require drilling into the chassis for most fitments.
Step up to the Premium Heavy-Duty kit if the ute rarely runs empty, and add a Digital Air Controller if pressure needs changing several times a day. Whichever configuration you land on, check the vehicle-specific fitment guide for your HiLux model year and cab style before ordering, because bracket kits differ across the range.
FAQ
What's the best load assist kit for a Toyota HiLux towing a caravan?
The Boss Extreme Series Load Assist Airbag Kit is the best overall choice for most HiLux owners towing a caravan or trailer. It works with the factory leaf springs and adjusts to the load you're carrying, which covers weekend towing without overbuilding the setup.
Does a load assist kit increase my HiLux's towing capacity?
No, a load assist kit does not increase a HiLux's legal GVM or towing capacity. It works with the factory suspension to reduce rear-end sag and improve stability within the vehicle's existing ratings.
Do load assist airbags work with the HiLux's factory leaf springs?
Yes, load assist airbags are designed to work alongside the factory leaf springs rather than replace them. The airbags add adjustable support at the rear axle while the leaf springs continue to do their normal job.
Can I fit a load assist kit myself on a HiLux?
A no-drill load assist kit can be fitted at home by a confident DIYer since it bolts to existing mounting points. Kits that require drilling into the chassis rail are better handled by a workshop familiar with the vehicle-specific fitment.
What's the difference between a standard and heavy-duty load assist kit for a HiLux?
A standard kit suits occasional towing and covers most weekend caravan or trailer use. A heavy-duty kit uses reinforced bellows built for sustained high pressure, which suits a HiLux that's loaded most days rather than just on tow weekends.
Is a load assist kit the same as a coil assist kit for a HiLux?
No, a load assist kit is designed for leaf-spring rear ends like the HiLux's, while a coil assist kit suits vehicles with coil-sprung rear suspension. Check your vehicle's rear suspension type before ordering either configuration.
How much air pressure should I run in HiLux load assist airbags?
Air pressure depends on the load you're carrying at the time, not a single fixed number. The correct starting range should be confirmed against the vehicle-specific fitment guide before towing.
How long does a Boss Air Suspension load assist kit last?
Boss Air Suspension backs its load assist kits with a five-year warranty. Actual service life depends on how the HiLux is used and how often the kit runs at higher pressure.
One last thing
A load assist kit only addresses the rear axle. If a HiLux is set up with a canopy, water tanks and long-range fuel for outback towing, it's worth checking diff breather kits for Toyota HiLux and Prado at the same time — extended corrugated running pushes hot air through the diffs and transmission, and low-mounted factory breather hoses can draw in water at causeway crossings. It's a five-minute check that pairs naturally with a load assist fitment.
