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Frustrated by trailer sway or uneven weight distribution when towing your fifth-wheel RV? Standard pin boxes often struggle with heavy loads, leading to dangerous fishtailing and premature wear. Curt’s Helux Coil-Spring Gooseneck Pin Box solves this with a patented coil-spring system that actively compensates for road imperfections while maintaining precise articulation—no more white-knuckle towing.
Features
- 20,000 lbs capacity – Engineered for heavy fifth-wheel trailers and toy haulers
- 3,900 lbs pin weight rating – Distributes load evenly for safer towing
- Coil-spring shock absorption – Reduces jarring impacts by 40% vs. rigid designs
- Greasable pivot points – Extends service life with easy maintenance
- Dual-latch security system – Prevents accidental uncoupling during transport
- Fits standard gooseneck couplers – No adapter needed for most trucks
Unlike traditional pin boxes that transfer every bump directly to your truck, the Helux’s coil springs act like a suspension system for your trailer. This means less fatigue for you and your vehicle, plus reduced stress on your RV’s frame. The result? Smoother rides on rough roads and confident handling in crosswinds.
Curt designed this pin box specifically for RVers who demand professional-grade equipment. The hardened steel construction resists corrosion from road salt, while the precision-machined kingpin ensures consistent performance trip after trip. It’s the upgrade your heavy-duty fifth-wheel deserves.
Tech Specs
- Brand: Curt™
- Model: Helux Coil-Spring Gooseneck
- Pin Weight Capacity: 3,900 lbs
- Gross Trailer Weight: 20,000 lbs
- Material: High-tensile steel with zinc plating
- Weight: 0 lbs (see manufacturer specs for actual weight)
- SKU: 2024044577
What's Included
- Curt Helux Coil-Spring Gooseneck Pin Box (fully assembled)
- Installation hardware kit
- Owner’s manual with torque specifications
| Brand | Curt™ |
|---|---|
| Model | Helux Coil-Spring Gooseneck |
| Pin weight capacity | 3,900 lbs |
| Gross trailer weight | 20,000 lbs |
| Material | High-tensile steel with zinc plating |
| Weight (lbs) | 0 |
| Sku | 2024044577 |
- Will this fit my 2018 grand design reflection fifth-wheel? Yes, it’s compatible with most fifth-wheel RVs that use a standard gooseneck coupler. Measure your existing pin box opening (typically 8" x 8") to confirm.
- How does the coil-spring system improve towing? The springs absorb vertical movement from road imperfections, reducing trailer bounce that causes sway. This maintains tire contact for better braking and cornering.
- Is professional installation required? While mechanically inclined owners can install it, we recommend professional installation to ensure proper torque specs and alignment.
- What’s the warranty coverage? Curt provides a 1-year limited warranty against manufacturing defects when purchased from authorized dealers like Elkhart RV Parts.
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.