Every bump, pothole, and highway expansion joint you drive over sends a jolt from your gooseneck ball straight into your RV's pin box and frame. A rigid pin box transfers all of that energy directly — and over thousands of miles, that repetitive stress cracks welds, loosens hardware, and turns minor road imperfections into major repair bills. The CURT Helux Coil-Spring Pin Box intercepts that punishment at the source, absorbing up to 30% more frame stress than a rigid pin box while delivering a measurably smoother, quieter ride for everyone on board.

Features & Benefits

• 4,300 lb. Pin Weight Capacity — Handles heavy fifth-wheel trailers on gooseneck hitches. Rated to 20,000 lbs. GTW.
• Coil Spring + Shock Absorber Technology — Proprietary Helux suspension absorbs the road vibration and chucking that rigid pin boxes transfer directly to your frame.
• Reduces Frame Stress Up to 30% — Measured, real reduction in the repetitive impacts that cause long-term RV frame fatigue, weld cracks, and structural failures.
• Smoother Ride for Everything Inside — Less jarring for passengers, pets, dishes, electronics, and every fastener holding your rig together.
• Auto-Latching 2-5/16" Coupler — Secure, fast hookup on standard gooseneck balls. No fumbling with manual latches at the campground.
• Zero Maintenance, Zero Break-In — Ready to tow immediately after installation. Unlike airbag systems, the coil design requires no break-in period and no ongoing maintenance.
• Lippert Frame Approved — Tested and approved for Lippert RV frames without voiding your frame warranty. Rhino Box bolt pattern compatible.
• SAE J2638 Safety Tested — Meets the industry standard for fifth-wheel coupling systems.
• Made in USA — Black powder coat finish for long-term corrosion resistance.

The difference between a rigid pin box and the Helux is something you feel on the very first trip. With a rigid box, every highway joint gives the whole trailer a sharp kick. On rough roads, you hear things rattling inside. Over thousands of miles, that constant vibration fatigues fasteners, works hinges loose, and eventually shows up as cracked welds or failed components. The Helux coil spring and shock absorber work together to dampen those impacts right at the connection between your truck and trailer — that energy dissipates as heat instead of stress on your RV's structure.

The 4,300 lb. model is the right choice for mid-to-large fifth-wheel trailers running on a gooseneck. The auto-latching coupler is simple to operate and locks without the fumbling that manual-latch designs require. Installation uses the standard Rhino Box bolt pattern and takes a few hours with basic tools. Approved for Lippert frames — which covers the majority of major RV brands. Ships approximately 200 lbs. via LTL freight.

Technical Specifications

• Part Number: 2024044578 | UPC: 612314057955
• Brand: CURT (a Lippert company)
• Max Pin Weight: 4,300 lbs. | Min Pin Weight: 2,450 lbs.
• GTW Rating: 20,000 lbs.
• Coupler: 2-5/16" auto-latching gooseneck ball coupler
• Bolt Pattern: Rhino Box compatible
• Frame Approval: Lippert RV frames
• Safety Standard: SAE J2638
• Finish: Black powder coat | Origin: Made in USA
• Shipping Weight: ~200 lbs. (ships LTL freight)

What's Included

• 1× CURT Helux coil-spring gooseneck pin box assembly
• Mounting hardware, safety chains & installation instructions

⚠️ Freight Shipment: This item ships LTL (~200 lbs.). Freight delivery included. Contact us before ordering with any delivery questions.

Also available: 5,000 lb. version (Part #2024044579) for heavier configurations. View →

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