CURT Helux 2024044578 Gooseneck Pin Box | 4,300 lb Pin

Match the pin box to measured loaded weight with the CURT Helux 2024044578, a 20,000-pound-rated gooseneck replacement pin box designed around a 2,000 lb suspension spring. Its auto-latching coupler connects to a standard 2-5/16-inch gooseneck ball.

Selecting by appearance or trailer length alone can produce the wrong spring match when traveling with a fifth-wheel RV. This model's optimal pin-weight selection range is 3,470–3,964 lb; choosing the correct spring requires checking actual trailer pin weight rather than relying on GVWR alone. A shock absorber works with the coil spring without an airbag to maintain.

Exact part specifications

• Manufacturer: CURT; manufacturer part number: 2024044578
• Connection: 2-5/16-inch gooseneck hitch ball
• Gross trailer weight rating: 20,000 lb, subject to lowest-rated component
• Coil spring rating: 2,000 lb
• Optimal pin-weight range: 3,470–3,964 lb
• Minimum unloaded pin weight: 2,450 lb; maximum loaded pin weight: 4,300 lb
• Steel construction with black powder-coated finish

Pin-box fitment

• Fits the Rhino Box bolt-mounting pattern on approved RV trailer frames.
• Requires a standard 2-5/16-inch gooseneck ball; not compatible with CURT RockerBall cushion balls.
• Verify trailer frame pattern, mounting dimensions, measured pin weight and towing equipment before ordering.

Ordering notes

Coil-and-shock Helux design, not an air-bladder suspension. The pin box is not a truck-specific bolt-on fit; it replaces the trailer's compatible pin-box mount. After installation, follow the manufacturer service instructions and applicable towing limits.