Timbren's Pivoting Suspension: A Deep Dive into a Radically Different RV Suspension System
Timbren is known for its SES (Suspension Enhancement System), but Big Truck Big RV explores a totally different approach to trailer suspension in this video. This pivoting axle suspension system uses trailing arms and rubber compression for damping. Is this the future of RV suspension or a niche product for specialized builds? Let's dive into the technology, applications, and potential drawbacks of this unique system.
Timbren's Traditional SES System: A Quick Recap
Before diving into the new pivoting system, it's important to understand Timbren's established SES system. The SES replaces your factory bump stops with thick, compressible rubber bushings spaced about an inch from the frame. This design provides normal suspension travel when unloaded, but engages under heavy loads to provide extra support and damping, preventing sag and bounce. Big Truck Big RV notes that while effective, the SES can sometimes create a harsher ride, especially on vehicles like an F450 where the suspension is already stiff.
He mentions his experience with the older SES system on his F450, stating it's great for 3/4-ton or half-ton trucks that frequently carry heavy loads. "Half ton trucks, doesn't take a lot of weight to make them squat down quite a bit and a Timbren system can definitely help in terms of supporting and keeping your truck a little bit more level whenever you're under heavy payload." However, it is crucial to remember that Timbren SES systems are not designed to increase your payload capacity; their primary function is to enhance ride quality and stability when loaded.
Unveiling the Pivoting Axle Suspension System
The core of this video focuses on Timbren's pivoting axle suspension system, a departure from their traditional SES product. This system features forward and rear trailing arms with large, compressible rubber bushings that provide suspension. The system is popular in Canada on high-end boutique trailers, but relatively uncommon in the US RV industry. The key challenge for widespread adoption in the US lies in the frame compatibility.
The main issue preventing widespread adoption in the US is the frame type used in most RVs. According to Big Truck Big RV, "the RV industry in the United States really rides mainly on I-beam frames or an S-beam style frame depending on if it's a Lippert frame or a BAL frame." The Timbren pivoting system requires a boxed frame for secure mounting because it needs bolts to pass through a large structure, something an I-beam or C-channel frame can't accommodate without significant modification.
Frame Compatibility: The Critical Hurdle
Big Truck Big RV emphasizes the frame compatibility issue, highlighting the difference between boxed and I-beam frames. Boxed frames, common in some boat trailers and higher-end cargo trailers, provide the necessary structure for securely mounting the Timbren system. I-beam frames, prevalent in most US-made RVs, lack the necessary surface area and require a custom-built platform or cage for adaptation. Such modifications would likely increase the overall cost and complexity, potentially deterring widespread adoption.
He suggests that Timbren could increase adoption by creating an adapter or platform that allows the system to be used on I-beam frames. This would involve designing a boxed cage that attaches to the I-beam and provides a mounting point for the suspension system. While this would add to the cost due to the extra steel and fabrication, it would significantly expand the potential market for the product.
Axleless Options and Height Adjustments
Timbren also offers an axleless version of the pivoting suspension system. This design uses a single trailing arm that bolts onto a tubular steel reinforcement beam spanning both sides of the trailer. What's especially interesting is that Timbren offers these systems in different heights. This allows for customization to achieve the desired trailer ride height. A shallower rubber bushing and less slope in the arm geometry create a lower ride height, while a taller system provides more ground clearance.
Big Truck Big RV points out that this adjustability is a significant advantage, allowing users to tailor the suspension to their specific needs and preferences. Whether you want a low-slung trailer for improved aerodynamics or a higher stance for off-road capability, Timbren has options to accommodate various applications. This flexibility adds to the appeal of the system, especially for custom trailer builds.
Potential Applications and Future Testing
Big Truck Big RV expresses interest in testing the Timbren pivoting suspension system on one of his own trailers, potentially a dump trailer. He believes a dump trailer would be a perfect application due to the variable loads it experiences. He's particularly interested in seeing how the system performs under heavy and constantly changing weight conditions.
He envisions loading the dump trailer to its maximum capacity and observing how the suspension handles the stress and uneven weight distribution. This real-world testing would provide valuable insights into the system's performance and durability. Ultimately, he is seeking to determine its suitability for heavy-duty applications where traditional leaf spring suspensions might struggle.
Key Takeaways
Timbren offers a pivoting axle suspension system that utilizes trailing arms and rubber compression for damping, offering a unique alternative to traditional leaf spring suspensions.
The system is popular on high-end boutique trailers in Canada but faces challenges for widespread adoption in the US due to frame compatibility issues. It requires a boxed frame for secure mounting, while most US RVs use I-beam frames.
Timbren could increase adoption by developing an adapter or platform that allows the system to be used on I-beam frames.
The system is available in axleless versions and with different height options, allowing for customization to achieve the desired trailer ride height.
Big Truck Big RV is considering testing the system on a dump trailer to evaluate its performance under heavy and variable loads.
The Timbren SES system, while effective, can sometimes create a harsher ride, especially on vehicles with already stiff suspensions.
Conclusion
Timbren's pivoting axle suspension system represents a significant departure from traditional RV suspension designs. While frame compatibility remains a hurdle for widespread adoption in the US, the system offers potential benefits in terms of ride quality, durability, and customization. Be sure to watch Big Truck Big RV's full video for a complete overview of the system and its potential applications. Don't forget to subscribe to Big Truck Big RV's channel and give the video a thumbs up!