On Air AL-KO Ducato / Boxer / Relay Rear Semi-Air Suspension Kit

SKU: AKS3101Z   |   If pre-ordered, allow 2–3 weeks for despatch. Updates provided.

The essential upgrade for AL-KO chassis motorhome owners who load their vehicle.
 
The AL-KO Chassis — A Premium Choice With One Practical Challenge
 
The AL-KO chassis is rapidly becoming the preferred choice for UK motorhome owners — and for good reason. Its innovative low frame design sits up to 310mm lower than a standard factory chassis, delivering a lower centre of gravity, superior cornering response, better crosswind stability, and a wider rear track for outstanding driving dynamics. It is, by design, a significantly better platform than the standard alternative.

But that same low frame creates a real-world problem: when you load the vehicle, the rear sits even lower. Extra water, lithium batteries, solar equipment, additional gear — any meaningful load pushes the rear down further, resulting in the chassis scraping or grounding on ramps, ferry embarkation ramps, steep driveways, and inclines. For owners who actually use their motorhome to its potential, this is a genuine and recurring problem.

Our rear semi-air suspension kit is the solution.
 
The Solution: On Air Rear Semi-Air Suspension
 
Developed by a company with over 30 years' experience in the design and manufacture of air suspension, this class-leading kit is precision-engineered for the AL-KO torsion beam chassis fitted to Fiat Ducato, Peugeot Boxer, and Citroën Relay-based motorhomes — covering X250 & X290 platforms from 2007 onwards, including both single and twin rear axle configurations.
 
By fitting our semi-air kit, you gain on-demand control over your rear ride height — directly counteracting the low-loading effect and eliminating the scraping and grounding that loaded AL-KO chassis owners commonly experience.
 
Also a Likely Requirement for Motorhome Up-Plating
 
If you're planning to have your motorhome's legal kerb weight increased through an up-plating programme—to accommodate extra water storage, lithium battery banks, solar equipment, or additional gear — fitting our rear semi-air suspension kit is a likely requirement as part of that process. To be clear: the kit itself does not increase your vehicle's legal kerb weight. Up-plating is carried out by a separate, specialist third-party company. Fitting this kit is a likely requirement as part of the up-plating process.
 
To be confirmed by a specialist up-plating third-party company.
 
How It Works
 
Our semi-air system works alongside the original AL-KO torsion beam suspension — the bespoke air springs assist the existing steel suspension rather than replacing it. You retain the structural integrity and handling benefits of your AL-KO chassis while gaining precise, adjustable control over rear ride height and load management.
 
On-demand rear height adjustment— raise the rear to clear ramps, ferry embarkation ramps, steep driveways, and long overhang situations
Directly offsets the low-loading effect— counteracts the rear drop caused by carrying extra weight on the low AL-KO frame
Increased roll stiffness— greater stability when passing high-sided vehicles or in crosswinds
Increased suspension travel and comfort across all road surfaces and at all legal payloads
Subtle static levelling— fine rear levelling adjustments when parked on uneven ground
Bespoke air springs— designed specifically for this application, not off-the-shelf components
Combine with one of our manual compressor or automatic levelling control systems for added convenience —available to purchase with the kit.
 
Key Benefits at a Glance
 
Solves the AL-KO loaded rear problem— clear ramps, ferries and steep inclines even when fully loaded
Likely requirement for third-party AL-KO motorhome up-plating programmes*
30+ years of air suspension expertise behind every kit
Works with your existing torsion beam— semi-air assist, not a full replacement
Improved stability and handling— especially in crosswinds and when loaded
Smoother, more comfortable ride at all legal payloads
Adjustable ride height— inflate or deflate as needed
Bespoke air springs for ultimate comfort and lifting ability
Complete kit— all components for a manual inflate setup, full fitting instructions included
Duplicate parts included for opposite side
Automotive-grade components— quality finishes and fixings throughout
Extra chassis cradle available if required — can be purchased with the kit
 
Ideal For AL-KO Motorhome Owners Who:
 
Carry extra water, lithium batteries, solar equipment or additional gear and experience the rear sitting too low
Experience scraping or grounding on ramps, ferry embarkation, or steep driveways when loaded
Are planning to have their motorhome up-plated by a third-party specialist
Want to improve ride comfort, stability, and handling on their AL-KO chassis motorhome
Own a tag axle, twin axle, or single axle AL-KO chassis motorhome
 
Important Notes
This kit does not increase your vehicle's legal kerb weight. Up-plating is performed by a separate specialist third-party company.
Fitting this kit is a likely requirement as part of the AL-KO up-plating process — to be confirmed by a specialist up-plating third-party company.
An extra chassis cradle may be required depending on your specific vehicle — this can be purchased with the kit.
Please refer to your vehicle manufacturer's literature for your vehicle's official payload capability.
Please contact us to confirm compatibility with your specific chassis build date and spec.