CURT Helux gooseneck pin boxes can look identical from outside while using different coil springs. The six gooseneck MPNs are selected by the trailer's actual pin weight, not by the trailer's length or the common 20,000-pound gross rating. Use the model number, spring rating and documented weight range to identify the correct assembly.
Determine the correct spring family
Measure the vertical weight at the pin/coupler connection using an appropriate scale method. Do not rely solely on an estimated percentage of trailer GVWR.
Account for the cargo and water conditions used in the manufacturer's definition of minimum and maximum weight.
Confirm the original pin-box bolt pattern, trailer structure and 2-5/16-inch towing connection against the current CURT installation instructions.
CURT Helux model and spring identification
All weights in the chart are manufacturer-published pounds. The spring rating is not the maximum permitted pin weight.
| Gooseneck MPN | Spring rating | Optimal pin weight | Minimum pin weight | Maximum pin weight |
|---|---|---|---|---|
| 2024044575 | 1,100 lb | 1,650–2,144 lb | 1,350 lb | 2,350 lb |
| 2024044574 | 1,250 lb | 2,145–2,484 lb | 1,550 lb | 2,700 lb |
| 2024044576 | 1,500 lb | 2,485–2,954 lb | 1,800 lb | 3,200 lb |
| 2024044577 | 1,800 lb | 2,955–3,469 lb | 2,200 lb | 3,900 lb |
| 2024044578 | 2,000 lb | 3,470–3,964 lb | 2,450 lb | 4,300 lb |
| 2024044579 | 2,300 lb | 3,965–5,000 lb | 2,800 lb | 5,000 lb |
Minimum: trailer without cargo, with fresh and waste-water tanks empty. Maximum: manufacturer-defined loaded cargo condition. Check the latest model-specific documentation for travel-ready loading and tank requirements.
Before replacing an existing pin box
Check the original pin-box label, bolt pattern, mounting brackets, welded structure and measured pin weight. A higher spring-rating variant is not automatically a safer replacement.
These six Helux gooseneck pin boxes are all described with a 20,000-lb gross trailer capacity, but their published spring ratings range from 1,100 to 2,300 lb and their permitted pin-weight ranges differ. Never exceed the lowest-rated trailer, pin box, hitch or tow-vehicle component.
For heavy pin-box installation, support the trailer connection securely and follow CURT's lifting, alignment and torque instructions. Have a qualified installer inspect the assembly if mounting compatibility is unclear.
Find the exact Helux gooseneck MPN
Open the individual model listing to review details and current availability.
CURT 2024044575
Spring rated 1,100 lb; documented optimal pin weight 1,650–2,144 lb.
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CURT 2024044574
Spring rated 1,250 lb; documented optimal pin weight 2,145–2,484 lb.
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CURT 2024044576
Spring rated 1,500 lb; documented optimal pin weight 2,485–2,954 lb.
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CURT 2024044577
Spring rated 1,800 lb; documented optimal pin weight 2,955–3,469 lb.
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CURT 2024044578
Spring rated 2,000 lb; documented optimal pin weight 3,470–3,964 lb.
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CURT 2024044579
Spring rated 2,300 lb; documented optimal pin weight 3,965–5,000 lb.
Check listing and availabilityRelated towing component identification
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