Lifting trailer suspension primarily involves increasing the distance between the trailer frame and the axle, effectively raising the overall ride height. This is achieved through various methods, including spring over axle conversions, axle flips, and the installation of lift blocks or spacers, each chosen based on the trailer’s design, intended use, and desired lift amount.
Why Lift Your Trailer Suspension?
There are several compelling reasons to consider lifting your trailer suspension. These include:
- Improved Ground Clearance: This is arguably the most significant benefit. Lifting the suspension allows the trailer to navigate uneven terrain, clear obstacles like rocks and branches, and avoid dragging on steep inclines. This is crucial for off-road campers, utility trailers used on job sites, and boat trailers launched in shallow or rocky waters.
- Larger Tire Fitment: A higher ride height provides more space for larger diameter tires. This can further enhance ground clearance, improve the trailer’s appearance, and potentially offer better load capacity (depending on the tire specifications).
- Aesthetic Appeal: For some, lifting a trailer is simply about achieving a more aggressive or rugged look. This is especially common in the off-road and overlanding communities.
- Leveling with Tow Vehicle: Lifting the trailer can sometimes be necessary to achieve a level towing setup, particularly when towing with a lifted truck or SUV. A level setup improves handling, reduces strain on the hitch, and promotes safer towing.
Methods for Lifting Trailer Suspension
The optimal method for lifting your trailer suspension depends on several factors, including the existing suspension type (leaf spring, torsion axle, etc.), the amount of lift required, and your budget.
Spring Over Axle (SOA) Conversion
The Spring Over Axle (SOA) conversion is perhaps the most common and effective method for achieving a significant lift, typically 3-6 inches. It involves relocating the leaf springs from under the axle to on top of the axle.
Pros:
- Significant lift achieved with relatively simple modification.
- Generally cost-effective for trailers already equipped with leaf spring suspensions.
Cons:
- Requires welding and fabrication skills or hiring a professional.
- Can alter the trailer’s center of gravity, potentially affecting handling.
- May require extending brake lines and electrical wiring.
Axle Flip
An axle flip is similar to an SOA conversion but typically applies to trailers with underslung axles (axles positioned below the leaf springs) from the factory. This involves flipping the axle orientation, placing it above the spring.
Pros:
- Similar to SOA conversion benefits.
- Can provide a substantial lift.
Cons:
- Same as SOA conversion concerns – welding, altered center of gravity, extending lines.
Lift Blocks and Spacers
Lift blocks or spacers are installed between the axle and the spring perch. These are typically made of steel or aluminum and come in various thicknesses to achieve the desired lift.
Pros:
- Relatively easy to install, often requiring only basic tools.
- Inexpensive compared to other lifting methods.
Cons:
- Provides a smaller lift compared to SOA or axle flips.
- Can potentially compromise suspension stability if excessively tall blocks are used.
- May require longer U-bolts to secure the axle to the springs.
Torsion Axle Modification
Lifting a trailer with a torsion axle is more complex. It typically involves modifying the axle mount or replacing the entire axle with one designed for a higher ride height. Contacting a qualified axle specialist is highly recommended for this type of modification.
Pros:
- Can provide a customized lift for torsion axle trailers.
- Maintains the independent suspension characteristics of torsion axles.
Cons:
- Generally more expensive and complex than lifting leaf spring suspensions.
- Requires specialized knowledge and equipment.
Important Considerations Before Lifting
Before undertaking any trailer suspension lift, consider the following:
- Trailer Weight Rating (GVWR): Ensure the lift will not compromise the trailer’s weight-carrying capacity. Larger tires, while beneficial, may also have different load ratings.
- Brake Line Length: Lifting the suspension will likely require extending the brake lines to ensure they are not stretched or damaged.
- Electrical Wiring: Similarly, check the electrical wiring to ensure sufficient slack after the lift.
- Hitch Height: After lifting the trailer, verify that the hitch height is still compatible with your tow vehicle. You may need to adjust the hitch or use a drop hitch to achieve a level towing setup.
- Safety: Always prioritize safety. Use proper lifting equipment, support the trailer securely, and double-check all connections. If you’re not comfortable performing the work yourself, consult a qualified mechanic.
Frequently Asked Questions (FAQs)
Q1: How much does it cost to lift a trailer suspension?
The cost varies greatly depending on the chosen method, the trailer type, and whether you perform the work yourself or hire a professional. Lift block installations can be very inexpensive, while SOA conversions and torsion axle modifications can cost significantly more. Expect to pay anywhere from $100 to $1000+ depending on the complexity of the job.
Q2: Will lifting my trailer suspension affect its handling?
Yes, lifting the suspension can alter the trailer’s center of gravity, which can affect handling, particularly in windy conditions. It’s crucial to ensure a level towing setup and to adjust your driving accordingly. Consider using a weight distribution hitch to improve stability.
Q3: What tools are needed for a typical SOA conversion?
You’ll typically need basic hand tools (wrenches, sockets, screwdrivers), a jack and jack stands, a welder, a grinder, and potentially a cutting torch. You’ll also need new spring perches, U-bolts, and potentially longer brake lines and electrical wiring.
Q4: Are there any legal restrictions on lifting trailer suspensions?
Regulations vary by state and municipality. Check your local laws regarding maximum trailer height and any specific requirements for suspension modifications.
Q5: Can I lift my travel trailer suspension myself?
While some lifting methods, like installing lift blocks, can be done by experienced DIYers, more complex modifications like SOA conversions require welding and fabrication skills. If you’re not comfortable with these skills, it’s best to consult a professional.
Q6: What size lift blocks are safe to use?
As a general rule, avoid using excessively tall lift blocks. A good practice is to stay within 2-3 inches of lift using blocks. Taller blocks can compromise suspension stability and increase the risk of axle wrap.
Q7: How do I extend my trailer’s brake lines after lifting the suspension?
You can purchase extended brake lines specifically designed for trailer applications. Ensure they are DOT-approved and properly installed. Alternatively, you can have custom brake lines fabricated by a reputable shop.
Q8: Will lifting my trailer void its warranty?
Potentially, yes. Modifying the suspension can void certain aspects of the trailer’s warranty, particularly those related to the suspension and axles. Check your warranty documentation for details.
Q9: How do I ensure a level towing setup after lifting my trailer?
Use a measuring tape to determine the height of the trailer coupler and the height of the tow vehicle’s hitch receiver. Calculate the difference and use a drop hitch or adjustable hitch to compensate. Ideally, the trailer should be level or slightly nose-down.
Q10: What are the benefits of using a weight distribution hitch after lifting my trailer?
A weight distribution hitch helps distribute the trailer’s weight evenly across the axles of both the trailer and the tow vehicle. This improves handling, reduces sway, and provides a more stable and comfortable towing experience, especially after lifting the suspension.
Q11: How often should I inspect my lifted trailer’s suspension?
Inspect your trailer’s suspension before each trip and after any significant off-road use. Check for loose U-bolts, damaged springs, and any signs of wear or damage to the lift components.
Q12: What type of lubricant should I use on my trailer’s leaf springs after lifting?
A dry graphite lubricant is generally recommended for trailer leaf springs. Avoid using oil-based lubricants, as they can attract dirt and grime.
By understanding the methods, considerations, and potential challenges involved, you can confidently approach lifting your trailer suspension and reap the benefits of improved ground clearance, larger tire fitment, and a more capable and visually appealing trailer. Remember to prioritize safety and consult with professionals when necessary.