The CURT Helux coil-spring fifth wheel pin box is engineered for RV towing that prioritizes ride quality and durability. Its proprietary coil and shock technology significantly reduces chucking and jarring, while decreasing stress on the RV frame and body by up to 30 percent compared to other pin box designs.

This model combines proven engineering with a virtually maintenance-free design. The automotive-grade coil spring provides consistent, reliable performance across all seasons, while the steel construction with black powder coating resists UV damage and road corrosion. SAE J2638 tested and approved for Lippert frames, it’s compatible with Rhino Box bolt mounting for straightforward installation.

• 18,000 lb gross weight capacity
• Gooseneck coupler with king pin
• Automotive-grade coil spring suspension
• 20-3/4″ length × 14-7/8″ width
• 2-row bolt pattern, 7-1/2″ × 2″ spacing
• Steel construction, black powder coated
• No break-in period required