Load Assist Kits

Heavy-Duty Rear Suspension Support

BOSS Load Assist Kits give your vehicle air-adjustable rear suspension that keeps it level, stable, and safe under load. Perfect for towing or carrying heavy gear, our kits reduce sag, control sway, and improve handling on any road surface.

Why choose a BOSS Load Assist Kit?

  • Easy install – most kits bolt on with basic hand tools.
  • Fully adjustable – inflate/deflate to suit your load.
  • Heavy-duty hardware – each airbag is rated to 2,500 lb (1,136 kg) per side and government-tested to over 750 psi.
  • Standard kits with double-bellow airbags – suitable for vehicles with stock suspension or up to a 2-inch lift.
  • Triple-bellow kits available – designed for vehicles with suspension lifts beyond 2 inches, providing extra travel and support.
  • Versatile fitments – for leaf and coil vehicles across popular 4WDs, sedans, utes, and trucks.
  • Upgradeable – add BOSS On Board Air for convenient in-cab pressure control.

What’s included

  • BOSS Extreme Series Double Bellow Airbags (genuine BOSS-branded)
  • Precision brackets & mounting hardware
  • Government-approved airline & dual Schrader valves
  • Step-by-step fitting instructions

How it helps

Keep your vehicle level when loaded, maintain steering and braking performance by keeping the front wheels in firm contact with the road, and enjoy a more controlled ride in both wet and dry conditions. Perfect for frequent or occasional heavy loads, caravans, trailers, boats, tools, and touring setups.

Full coil-replacement bag kits are also available for popular coil 4WDs and sedans. Pair any Load Assist Kit with a BOSS On Board Air control kit to adjust pressures from the driver’s seat.