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When you're towing a heavy fifth-wheel on a gooseneck hitch, your pin box takes constant punishment. Every road imperfection transfers directly through it into your RV's frame — and a rigid pin box does nothing to stop that energy. The CURT Helux Coil-Spring Pin Box (5,000 lb. version) is engineered to absorb that stress before it becomes structural damage. Its proprietary coil spring and shock absorber system reduces frame stress by up to 30% compared to rigid alternatives, delivering a measurably smoother ride for your rig, your cargo, and everyone inside.
Features & Benefits
- 5,000 lb. Pin Weight Capacity — The highest-capacity Helux gooseneck model. Full 20,000 lb. GTW rating.
- Coil Spring + Shock Absorber Technology — Intercepts chucking and road vibration at the hitch connection. Energy dissipates as heat, not frame stress.
- Up to 30% Less Frame Stress — Measured protection against the repetitive impacts that fatigue welds, crack frames, and loosen fasteners over time.
- Headroom Where It Counts — At 5,000 lb. capacity, you stay well within rating even with full water tanks, gear, and passengers — not running close to the edge.
- Auto-Latching 2-5/16" Coupler — Fast, secure hookup every time. No fumbling with manual latches.
- Zero Maintenance, Zero Break-In — Coil technology needs nothing ongoing. Tow full performance from day one.
- Lippert Frame Approved — Use on Lippert-framed trailers without voiding your frame warranty. Rhino Box bolt pattern compatible.
- SAE J2638 Safety Tested — Meets industry coupling safety standards.
- Made in USA — Black powder coat for long-term durability.
Stepping up to the 5,000 lb. Helux isn't just about the number — it's about margin. Even when your trailer is fully loaded, you're well within the pin weight rating rather than pushing the limits of a lower-capacity box. That headroom matters for long-term durability and for the occasional trip when you're carrying more than usual. The Helux suspension system performs consistently across the full weight range: absorbing the impacts that a rigid pin box would transmit directly to your frame, protecting structural welds and components from the kind of fatigue that shows up as expensive damage years down the road.
Installation follows the standard Rhino Box bolt pattern, compatible with Lippert-framed trailers across dozens of major RV brands. The auto-latching coupler makes hookup reliable and fast on every trip, and zero break-in means you leave the driveway after install and immediately tow at full performance. Ships approximately 200 lbs. via LTL freight.
Technical Specifications
- Part Number: 2024044579 | UPC: 612314057962
- Brand: CURT (a Lippert company)
- Max Pin Weight: 5,000 lbs. | Min Pin Weight: 2,850 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.
Also available: 4,300 lb. version (Part #2024044578). View →
Compare CURT Helux Gooseneck Pin Boxes
| Model | Max Pin Weight | Min Pin Weight | GTW | Best For | View |
|---|---|---|---|---|---|
|
Helux 4,300 lb. #2024044578 |
4,300 lbs. | 2,450 lbs. | 20,000 lbs. | Mid-to-large fifth-wheels — excellent value | View Product → |
|
Helux 5,000 lb. #2024044579 |
5,000 lbs. | 2,850 lbs. | 20,000 lbs. | Heaviest fifth-wheels — maximum capacity & headroom | You are here |
| Part number | 2024044579 |
|---|---|
| Pin weight (lbs) | 5000 |
| Tow capacity (lbs) | 20000 |
| Suspension type | Coil Spring |
| Brand | CURT (a Lippert company) |
| Max pin weight | 5,000 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 | |
| Shipping weight | ~200 lbs. (ships LTL freight) |
| ⚠️ freight shipment | This item ships LTL (~200 lbs.). Freight delivery included. |
| Also available | 4,300 lb. version (Part #2024044578). |
- Why choose the 5,000 lb. over the 4,300 lb. model? The 5,000 lb. model gives you more headroom. Even when your trailer is fully loaded with water, gear, and passengers, you stay well within the capacity rating rather than near the edge. This matters for long-term durability and for trips where your load is heavier than usual.
- How does the coil spring system improve towing? The Helux coil spring and shock absorber absorb road vibration and chucking at the hitch connection point. Energy that would otherwise transfer directly into your RV's frame dissipates as heat, reducing frame stress by up to 30% and delivering a noticeably smoother, quieter ride.
- Is there a break-in period? No — the Helux coil system requires no break-in period. Tow at full performance immediately after installation. No air pressure to manage, no break-in miles required.
- Does it fit my lippert-framed trailer? Yes — it's specifically approved for use on Lippert RV frames without voiding the frame warranty, and uses the standard Rhino Box bolt pattern found on most fifth-wheel trailers.
- Why does it ship freight? At approximately 200 lbs., this item ships via LTL freight. Freight delivery is included in the price. Contact us if you have questions about delivery to your address before ordering.
Need a Mobile RV Tech Near You?
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