Best Load Assist Kit for Camper Trailer Towing 2026
Rear-end sag is the most common suspension complaint from camper trailer owners in 2026, and a load assist kit for camper trailer towing is usually the fastest fix that doesn't involve replacing the whole suspension. This guide ranks the load assist kits that suit the most common tow vehicles — utes, wagons and 4WDs — and tells you which one to buy for your setup.
- Boss Air Suspension's vehicle-specific load assist kit for camper trailer towing starts with matching your exact model and lift height — Buy the kit built for your rig, not a universal one.
- The Toyota Hilux and Ford Ranger/VW Amarok kits cover the two most common camper trailer tow vehicles on Australian roads in 2026.
- Standard height kits suit stock suspension; up to 2 inch lift versions exist for lifted tow rigs — picking the wrong one causes fitment issues.
- A load assist kit does not increase your vehicle's legal GVM or towing capacity — it improves ride height and stability within existing limits.
Why this matters
A loaded camper trailer pulls down on the tow ball, and that load transfers straight into your vehicle's rear suspension. Add a rooftop tent, water tanks and recovery gear and most utes and wagons will squat at the rear within a few hundred kilometres of fitting a camper trailer.
That sag isn't just cosmetic. It lifts the headlights, reduces steering feel and makes the vehicle wander under braking. A load assist kit uses airbags working alongside your existing coil or leaf springs to help level the vehicle and hold ride height under load.
It's worth being clear on what these kits don't do. A load assist kit for camper trailer towing does not increase your vehicle's legal GVM, payload or towing capacity. Check your compliance plate and the camper trailer's ATM before you load up — the kit improves stability and ride height within your existing limits, not beyond them.
How we ranked these kits
Each kit below is assessed against four things that matter for camper trailer towing: vehicle-specific fitment (not a universal fit-all), lift height compatibility, ease of bolt-on installation, and warranty backing. Boss Air Suspension builds kits to suit hundreds of individual vehicle applications rather than one generic airbag for every ute, and that specificity is what keeps installation straightforward and the ride predictable once the trailer's hooked up.
Stock height and lifted versions of most kits exist separately, because a suspension lift changes the airbag's working range. Getting that detail right up front avoids the most common fitment mistake reported by installers in 2026: buying the standard-height kit for a vehicle that's already been lifted.
The ranked list
1. Toyota Hilux 2015+ load assist kit — the volume seller
The Hilux is one of the most towed vehicles behind a camper trailer in Australia, and this kit is built specifically for 2015-onward 4WD models with up to 2 inch of lift. It bolts onto the existing leaf spring setup and uses Boss's Extreme Series airbags to add adjustable support under load.
Air pressure is adjustable to match trailer weight on any given trip, so an empty run to the servo doesn't ride the same as a fully loaded weekend away. Installation follows a bolt-on process without cutting or drilling on most applications.
Verdict: Buy if you're running a 2015+ Hilux with a standard-to-2-inch lift and towing a camper trailer regularly. Check the Hilux load assist kit fitment notes against your exact build date before ordering.
2. Ford Ranger / VW Amarok next-gen kit — the shared platform pick
2022+ Ranger and 2023+ Amarok share a rear suspension platform, so Boss builds one kit to suit both, again in an up-to-2-inch lift version. This is relevant because the next-gen Ranger and Amarok have become common camper trailer tow rigs since 2023, and factory suspension on both sags noticeably once a loaded trailer goes on the tow ball.
The kit includes the airbags, mounting brackets, air lines and fittings required, with adjustable pressure so you can back it off for unladen driving and wind it up for towing days.
Verdict: Buy for 2022+ Ranger and 2023+ Amarok owners running standard-to-2-inch lift. There's a separate version for greater-than-2-inch lift setups, so confirm your ride height before checkout on the Ranger and Amarok load assist kit page.
3. Isuzu D-Max / Mazda BT-50 standard height kit — the daily tower
D-Max and BT-50 share a platform too, and this standard-height kit covers 2010-2020 model years without a lift kit fitted. It's a common pairing for owners towing lighter camper trailers on weekend trips rather than full-time touring.
Because it's built for standard ride height, it suits vehicles straight off the showroom floor or with only minor accessory weight added — bull bar, canopy, that sort of thing.
Verdict: Buy for stock-height D-Max and BT-50 utes. If your vehicle already has a suspension lift, the D-Max and BT-50 load assist kit in standard height won't be the right SKU — a lifted version exists for that scenario.
4. Toyota LandCruiser leaf spring rear kit — the heavy tourer
LandCruiser owners towing larger camper trailers or off-road trailers over long distances need more sustained load support than a lighter ute, and this leaf-spring rear kit is built for standard-height 80/100/200-series applications. It's a common fit for full-time touring setups carrying dual battery systems, long-range tanks and camper trailers together.
Because the LandCruiser platform spans multiple decades and several lift options, Boss stocks 2, 3 and 4 inch lift versions alongside the standard-height kit — matching the right one to your exact rear suspension setup matters more here than on almost any other vehicle in this list.
Verdict: Buy if your LandCruiser sits at standard height and tows regularly. Confirm your lift height on the LandCruiser leaf spring load assist kit page before ordering, since the wrong lift-height SKU is the single biggest return reason on this platform.
5. Boss Auto Pressure Controller Kit — the in-cab upgrade
An airbag kit alone still needs a way to add or release pressure, and most owners start with a hand pump before upgrading. The Auto Pressure Controller Kit pairs a compressor, tank and fittings so pressure can be adjusted from the cab while towing, rather than pulling over to top up manually.
This isn't a replacement for the load assist kit itself — it's the accessory that makes day-to-day adjustment practical once the camper trailer's hooked up and loaded differently trip to trip.
Verdict: Consider as a second purchase once your vehicle-specific load assist kit is fitted, particularly if you tow with varying loads across the year.
Comparison table
| Kit | Vehicle | Lift compatibility | Verdict |
|---|---|---|---|
| Hilux load assist kit | Toyota Hilux 4WD 2015+ | Up to 2 inch | Buy |
| Ranger/Amarok load assist kit | Ford Ranger 2022+, VW Amarok 2023+ | Up to 2 inch | Buy |
| D-Max/BT-50 load assist kit | Isuzu D-Max, Mazda BT-50 2010-2020 | Standard height | Buy |
| LandCruiser leaf spring kit | Toyota LandCruiser 80/100/200 Series | Standard height | Buy |
| Auto Pressure Controller Kit | Any vehicle with airbags fitted | Not lift-dependent | Consider |
Where to buy
- Match the kit to your exact model year, drivetrain and current lift height before ordering — the biggest fitment errors in 2026 come from picking the standard-height version for a lifted vehicle, or vice versa.
- Buy the vehicle-specific kit rather than a universal airbag, since bracket and mounting design differs between platforms even within the same brand.
- Confirm what's included — brackets, air lines and fittings should come in the box, so you're not sourcing pneumatic parts separately after the kit arrives.
Every Boss Air Suspension load assist kit is backed by a five-year warranty and Australian-based product support, and the brand has supplied more than 50,000 kits to date. For camper trailer towing specifically, the caravan and camper trailer air suspension setup guide covers pressure settings for loaded versus unloaded runs in more depth.
FAQ
What's the best load assist kit for camper trailer towing in 2026?
There's no single best kit — it depends on your tow vehicle. The Toyota Hilux 2015+ and Ford Ranger/VW Amarok next-gen kits are the two most requested in 2026 because those utes are the most common camper trailer tow vehicles on Australian roads.
Does a load assist kit increase my towing capacity?
No. A load assist kit improves ride height, stability and rear suspension support under load, but it does not increase your vehicle's legal GVM, payload or towing capacity. Always work within your compliance plate figures and the trailer's ATM.
Is a load assist kit suitable for a lifted 4WD?
Yes, but you need the lift-specific version of the kit, not the standard-height one. Boss Air Suspension builds separate SKUs for up to 2 inch, and greater-than-2-inch lift heights across most vehicle applications.
Can I adjust the airbags myself while towing?
Yes, air pressure in a load assist kit is adjustable to suit the load, and can be topped up with a hand pump or an onboard compressor system like the Boss Auto Pressure Controller Kit for in-cab adjustment.
Do load assist kits work with leaf spring suspension?
Yes. Kits like the Toyota LandCruiser leaf spring rear kit are built to work alongside the vehicle's existing leaf springs, adding adjustable airbag support rather than replacing the spring setup.
How long does installation take?
Most vehicle-specific kits are designed as a bolt-on installation without cutting or drilling, but exact time depends on the vehicle and whether a workshop or DIY install is used. Check the specific kit's fitment notes for details.
What's the difference between a standard height and lifted load assist kit?
A standard-height kit is built for a vehicle at factory ride height, while a lifted version accounts for the extra travel and altered geometry created by a suspension lift. Fitting the wrong one causes poor airbag performance or fitment issues.
Is a load assist kit covered by warranty?
Boss Air Suspension load assist kits carry a five-year warranty with Australian-based product support as of 2026.
One last thing
The most overlooked detail in 2026 isn't which kit to buy — it's checking your build date and rear suspension type before ordering, since two vehicles with the same model name can use completely different kits depending on lift height or model year split. A five-minute check against the vehicle application guide saves a return and gets the right kit fitted the first time.
