Adding Shocks to Your Duratorque Trailer?

Duratorque axles have become a popular choice for many trailer owners, especially those hauling boats or other sensitive cargo, largely due to their reputation for being quiet and remarkably maintenance-free. Unlike traditional leaf spring or coil spring suspensions, Duratorque axles employ a unique rubber torsion system, offering a compact and often smoother ride without the exposed components prone to rust. However, a common question that arises among trailer enthusiasts is whether external shock absorbers can or should be added to these systems to further enhance ride quality or stability.

This article will delve into the functionality of Duratorque suspensions, explore the role of shock absorbers in traditional setups, and address the feasibility and necessity of integrating external damping into a system already designed to provide its own form of shock absorption. We'll also consider alternatives to improve your trailer's performance and longevity, ensuring you make informed decisions for your valuable assets.

Understanding Duratorque Trailer Suspensions

The core of a Duratorque (or Torflex, as it's also known) axle lies in its ingenious design, which eliminates the need for leaf springs, coil springs, and conventional shock absorbers. Instead, four rubber cords are encased within the axle tube, surrounding a central square or hexagonal steel bar. As the wheel moves over bumps and dips, the spindle arm rotates, twisting these rubber cords. This twisting action provides both the springing and damping effects for the suspension.

Key Characteristics of Duratorque Axles:

• Self-Damping: The inherent friction and resistance within the rubber cords provide a natural damping effect, absorbing road shocks and preventing excessive bouncing. This is a primary reason why external shocks are often deemed redundant.
• Independent Suspension: Each wheel operates independently, meaning a bump on one side doesn't directly affect the other. This contributes to a smoother ride and better tracking.
• Low Maintenance: With no metal-on-metal components requiring lubrication (like spring shackles) and fewer moving parts, Duratorques are indeed low maintenance. However, as with any trailer component, periodic inspection is crucial, especially concerning brake systems in saltwater environments, which are notorious for corrosion.
• Compact Design: Their self-contained nature allows for a lower trailer deck height and more efficient use of space.
• Quiet Operation: The absence of metal springs and conventional shocks means less noise during travel.

Despite these advantages, some users might perceive the ride as being firmer or less 'cushioned' than a traditional spring-and-shock setup, especially with lighter loads or on very rough terrain. This perception often leads to the question of adding external shocks.

The Role of Shock Absorbers in Traditional Suspensions

In a conventional suspension system (e.g., leaf springs, coil springs), the springs themselves are designed to absorb vertical impacts and store energy. However, if left unchecked, this stored energy would cause the vehicle or trailer to bounce uncontrollably after hitting a bump. This is where shock absorbers come in.

How Shock Absorbers Work:

Shock absorbers, or dampers, are hydraulic devices filled with fluid. When the suspension moves, a piston inside the shock absorber pushes through this fluid, converting the kinetic energy of the spring's oscillation into heat, which then dissipates. Their primary functions are to:

• Control Spring Oscillation: Prevent the springs from bouncing excessively after compression or extension.
• Improve Tyre Contact: Keep the tyres firmly on the road, which is crucial for braking, steering, and overall stability.
• Enhance Ride Comfort: By smoothing out the ride and reducing harshness.
• Reduce Wear: Minimise stress on other suspension components by controlling motion.

Can You Put Shocks on a Duratorque Trailer Suspension?

The short answer is typically no, or at least not easily or effectively, and it's generally not recommended. Here's why:

The Duratorque axle is an integrated spring and damper system. Its rubber cords provide both the suspension and the damping action. Adding external hydraulic shock absorbers would be akin to adding a second layer of damping to a system already designed to dampen itself. This can lead to several issues:

• Redundancy and Interference: The external shocks might fight against the natural damping characteristics of the rubber torsion, leading to an over-damped system. This could result in a harsher ride, as the suspension struggles to react quickly to road imperfections.
• Lack of Mounting Points: Duratorque axles are not designed with integrated mounts for external shock absorbers. Fabricating custom mounts would be complex, require welding to the axle tube (which could compromise its integrity or void warranties), and finding suitable chassis attachment points can be challenging.
• Compromised Performance: Instead of improving the ride, you might inadvertently make it worse. An improperly matched or installed shock could limit the suspension's travel, create undue stress on components, or even lead to premature failure of the Duratorque unit itself.
• Cost vs. Benefit: The expense and effort involved in custom fabrication for a potentially negative or negligible improvement often outweigh any perceived benefits.

While theoretically, anything is possible with enough custom fabrication, it deviates significantly from the intended design and purpose of a Duratorque axle. Manufacturers do not offer kits or recommend adding external shocks for these reasons.

Why Do People Want to Add Shocks? Addressing the Underlying Desire

The desire to add shocks often stems from a wish for a smoother ride, better high-speed stability, or reduced rebound for delicate cargo. Let's address these points and consider more appropriate solutions:

• Smoother Ride: While Duratorques offer a good ride, their damping is fixed. For very light loads, they might feel stiff. For heavy loads, they might feel just right.
• Better Stability / Reduced Bounce: Excessive bounce often points to other issues rather than a lack of external shocks on a Duratorque.

Alternatives to Improve Your Trailer's Ride and Longevity

Instead of attempting to modify your Duratorque axle with external shocks, consider these effective strategies to enhance your trailer's performance and ensure its longevity:

1. Proper Load Distribution

This is arguably the most critical factor for trailer stability and ride quality. Ensure your trailer's load is balanced correctly, with adequate tongue weight (typically 10-15% of the total trailer weight). An imbalanced load can cause sway, excessive bouncing, and put undue stress on the suspension, regardless of its type.

2. Tyre Pressure Management

Correct tyre pressure is vital. Over-inflated tyres can lead to a harsh ride and reduced tyre contact, while under-inflated tyres can cause excessive heat build-up, poor handling, and increased rolling resistance. Always follow the tyre manufacturer's recommended pressures for your specific load.

3. Axle Capacity Matching

Ensure your Duratorque axle's capacity is appropriate for your typical maximum load. If your axle is consistently overloaded, it will perform poorly and wear out prematurely. Conversely, an excessively oversized axle for a very light load might feel stiffer than necessary.

4. Regular Inspections and Maintenance

While Duratorques are low maintenance, they are not entirely maintenance-free. Regular checks are essential:

• Rubber Condition: Inspect the rubber cords for signs of cracking, perishing, or bulging.
• Spindle Arms: Check for any bending or damage.
• Mounting Bolts: Ensure all bolts securing the axle to the trailer frame are tight. Loose bolts can lead to instability and accelerated wear.
• Brakes: As mentioned in the original query, brakes, especially in saltwater environments, require diligent inspection and maintenance to prevent corrosion. Regular flushing with fresh water after saltwater exposure and applying appropriate anti-corrosion treatments are crucial.
• Wheel Bearings: These still require regular inspection and greasing (if applicable) to ensure smooth operation and prevent failures.

5. Consider a Different Trailer/Suspension Type (for Future Purchases)

If ride quality for extremely sensitive cargo or very specific rough terrain is an absolute priority and your Duratorque isn't meeting those needs, then for future purchases, you might consider trailers with traditional leaf spring or coil spring suspensions that are explicitly designed to incorporate external shock absorbers. However, weigh this against the Duratorque's inherent benefits like compactness and lower maintenance.

Comparison: Duratorque vs. Leaf Spring Damping

Frequently Asked Questions About Duratorque Axles

Q: Are Duratorque axles truly maintenance-free?

A: While they require significantly less maintenance than traditional spring suspensions, they are not entirely maintenance-free. The rubber cords themselves require little to no maintenance, but the wheel bearings, brakes, and mounting hardware still need regular inspection and servicing, especially in harsh environments like saltwater.

Q: Do Duratorques go backwards?

A: This question likely refers to the trailer's behaviour when reversing. The Duratorque suspension itself is a passive component and does not directly 'go backwards' or forwards in an active sense. Its design supports the trailer's weight and dampens road input regardless of the direction of travel. Trailer stability when reversing is primarily influenced by proper load distribution, the type of hitch, and the condition and type of brakes (e.g., surge brakes might react differently when reversing unless manually disengaged or designed for reverse lock-out). The suspension itself does not impede or assist reversing.

Q: Can Duratorque axles be repaired?

A: Generally, no. If the rubber cords inside the axle tube fail or the spindle arm becomes damaged, the entire axle unit typically needs to be replaced. They are not designed for internal repair by the user.

Q: What are the signs of a failing Duratorque axle?

A: Signs include excessive bouncing or swaying of the trailer, uneven tyre wear, the trailer sitting unusually low on one side, visible cracking or deterioration of the rubber around the spindle, or a noticeable change in ride quality.

Q: Are Duratorque axles good for off-road use?

A: Their independent suspension and high ground clearance can be beneficial for light to moderate off-road use. However, their limited vertical travel compared to some other suspension types might be a consideration for extreme off-roading with very large obstacles. The robustness of the axle beam itself is also a factor.

Conclusion

While the idea of adding external shocks to a Duratorque trailer suspension might seem appealing for a smoother ride, it's generally not a practical or recommended modification. The Duratorque system is inherently designed to provide its own spring and damping action through its unique rubber torsion elements. Attempting to integrate external shock absorbers can lead to redundancy, performance issues, and complex, potentially weakening, custom fabrication.

Instead, focus on optimising your trailer's performance through proper load distribution, maintaining correct tyre pressures, and conducting regular inspections of all components, particularly the brakes. Understanding the robust design of your Duratorque axle and adhering to best practices for trailer maintenance will yield far greater benefits in terms of ride quality, stability, and the overall longevity of your trailer.

If you want to read more articles similar to Adding Shocks to Your Duratorque Trailer?, you can visit the Suspension category.