Quick Facts
- Purchase verification required. Refer to instruction sheet for pin weight measuring process
- Proprietary coil and shock technology reduces chucking and jarring to protect trailer and gear
- Reduces force on the RV frame and body by 30% compared to similar pin boxes
- Automotive-grade coil spring provides a more comfortable ride for pets and passengers
- No break-in period — just install it and go
- Virtually maintenance-free design improves user experience over airbags
- Compatible with Rhino Box bolt-mounting pattern
- Robust steel construction and black powder coat finish
- Tested for safety in accordance with SAE J2638
- Designed, welded, and coated in Wisconsin
- Approved on Lippert RV frames (will not void warranty)
- Up to 18,000 lb. capacity
- Limited lifetime warranty (one-year finish, one-year parts)
- Patent pending
Specifications
- SKU: HELUX-18K-FIFTH-WHEEL
- Brand: Curt™
- Series: Helux
- Product Color: Black
- Weight Capacity: 18,000 lbs.
- Material Type: Steel
- Quantity In Package: 1
- Warranty Term: Limited lifetime warranty (one-year finish, one-year parts)
- Unit of Measure: EA
- Universal Part: Yes
- Shipping Dimensions: 24" L x 21" W x 44" H, 169 lbs.

CURT Helux Coil-Spring 5th Wheel Pin Box, 18,000 lbs. Capacity

SKU #: HELUX-18K-FIFTH-WHEEL

Universal Vehicle Fit

The CURT Helux™ 5th wheel pin box ensures smoother towing with a coil spring and shock absorber design, reducing jolts, vibrations, and gear shifts. Built from durable steel with a maintenance-free system, it’s compatible with Lippert frames.

To find the Max Pin Weight needed for your 5th Wheel, see How to Select the Right Helux for You .

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Quick Facts
- Purchase verification required. Refer to instruction sheet for pin weight measuring process
- Proprietary coil and shock technology reduces chucking and jarring to protect trailer and gear
- Reduces force on the RV frame and body by 30% compared to similar pin boxes
- Automotive-grade coil spring provides a more comfortable ride for pets and passengers
- No break-in period — just install it and go
- Virtually maintenance-free design improves user experience over airbags
- Compatible with Rhino Box bolt-mounting pattern
- Robust steel construction and black powder coat finish
- Tested for safety in accordance with SAE J2638
- Designed, welded, and coated in Wisconsin
- Approved on Lippert RV frames (will not void warranty)
- Up to 18,000 lb. capacity
- Limited lifetime warranty (one-year finish, one-year parts)
- Patent pending
Specifications
- SKU: HELUX-18K-FIFTH-WHEEL
- Brand: Curt™
- Series: Helux
- Product Color: Black
- Weight Capacity: 18,000 lbs.
- Material Type: Steel
- Quantity In Package: 1
- Warranty Term: Limited lifetime warranty (one-year finish, one-year parts)
- Unit of Measure: EA
- Universal Part: Yes
- Shipping Dimensions: 24" L x 21" W x 44" H, 169 lbs.

Product description

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Learn & Explore

Product description

The CURT Helux™ 5th wheel pin box redefines towing comfort with advanced coil spring and shock absorber technology. Designed to replace standard pin boxes, it minimizes chucking, jarring, and bouncing during travel, ensuring a smoother ride for both driver and passengers. Its innovative design also protects your RV’s gear and belongings by reducing aggressive shifting. This pin box enhances ride quality for pets and passengers by eliminating excessive rattling and vibrations from road hazards. Its premium steel construction, paired with a durable black powder coat finish, ensures long-lasting reliability for miles of towing. Maintenance-free coil spring technology provides dependable performance without the hassle of upkeep, outperforming traditional air systems. Approved for use on Lippert frames, the CURT Helux pin box offers a smoother hitching experience for seamless towing. Its robust engineering reduces wear and tear on RV hardware, making it a smarter, worry-free choice for your towing needs. Whether for long trips or local getaways, this pin box delivers comfort and performance you can rely on.

Features

SMOOTHER, MORE COMFORTABLE RIDE — The CURT Helux™ coil-spring 5th wheel pin box utilizes innovative coil and shock technology to minimize jarring and chucking while towing
REDUCED FRAME STRESS — Engineered to protect your RV, the Helux coil-spring 5th wheel pin box reduces force on the frame and body by 30% compared to similar designs
NO HASSLE INSTALLATION & MAINTENANCE — With no break-in period required, the Helux coil-spring 5th wheel pin box is ready to perform the moment it’s installed
DURABLE & RELIABLE CONSTRUCTION — Built with robust steel and coated in a black powder finish, the Helux coil-spring 5th wheel pin box is designed to withstand the rigors of long-haul towing
COMPATIBLE & WARRANTY-FRIENDLY — Designed to fit the Rhino Box bolt-mounting pattern, the Helux coil-spring 5th wheel pin box seamlessly integrates with Lippert RV frames without voiding your warranty

Warning Cancer and reproductive harm. www.P65Warnings.ca.gov

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Support Documentation

Explore manuals, videos, FAQs and more associated with this product.

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Learn & Explore

What is a 5th Wheel Hitch?

What is a 5th Wheel Hitch?
Thinking about buying a 5th wheel hitch? In this blog, we'll cover everything you need to know, starting by answering the basic question: what is a 5th wheel hitch?

Read more
Replace Your 5th Wheel Pin Box with Confidence

Replacing your 5th wheel pin box can dramatically improve the strength, stability, and ride quality of your towing setup. With modern designs that reduce chucking and simplify installation, it’s one upgrade that can make every mile feel more controlled and predictable.

Read more
How to Choose the Right 5th Wheel Pin Box Size

Replacing a worn pin box is the perfect time to improve your towing experience. Discover how to choose the correct 5th wheel pin box size and why Helux upgrades provide better stability, control, and durability.

Read more
5th Wheel Pin Box Upgrade: How to Improve Ride Quality & Reduce Chucking

Upgrading your 5th wheel pin box is one of the easiest ways to improve ride quality and reduce towing stress. The right pin box can cut down on chucking, protect your hitch, and make every mile smoother. Here’s how to choose the best upgrade for your setup.

Read more
How to Adjust a 5th Wheel Pin Box

A misaligned or improperly adjusted 5th wheel pin box can make hitching and unhitching difficult while putting extra strain on your truck and trailer. This guide covers the step-by-step adjustment process, when to seek professional help, and why upgrading to a CURT Helux pin box can provide a long-term solution.

Read more

Get the most out of your experience

What is a 5th Wheel Hitch?

What is a 5th Wheel Hitch?
Thinking about buying a 5th wheel hitch? In this blog, we'll cover everything you need to know, starting by answering the basic question: what is a 5th wheel hitch?

Read more
Replace Your 5th Wheel Pin Box with Confidence

Replacing your 5th wheel pin box can dramatically improve the strength, stability, and ride quality of your towing setup. With modern designs that reduce chucking and simplify installation, it’s one upgrade that can make every mile feel more controlled and predictable.

Read more
How to Choose the Right 5th Wheel Pin Box Size

Replacing a worn pin box is the perfect time to improve your towing experience. Discover how to choose the correct 5th wheel pin box size and why Helux upgrades provide better stability, control, and durability.

Read more
5th Wheel Pin Box Upgrade: How to Improve Ride Quality & Reduce Chucking

Upgrading your 5th wheel pin box is one of the easiest ways to improve ride quality and reduce towing stress. The right pin box can cut down on chucking, protect your hitch, and make every mile smoother. Here’s how to choose the best upgrade for your setup.

Read more
How to Adjust a 5th Wheel Pin Box

A misaligned or improperly adjusted 5th wheel pin box can make hitching and unhitching difficult while putting extra strain on your truck and trailer. This guide covers the step-by-step adjustment process, when to seek professional help, and why upgrading to a CURT Helux pin box can provide a long-term solution.

Read more

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