Trying to Find Curt Helux Pin Box that Fits 2025 Riverstone 39RKFB
Updated 03/13/2026 | Published 03/06/2026
Question:
I am looking to buy the Curt Helux fith wheel king pin, I want to confirm I am ing the correct item number, I have a 2025 Riverstone 39RKFB,Vin 4x4frsr28n0002631, it is around 19 k gross weight and 3100 pin weight.
asked by: James B
Expert Reply:
Hey James, could I get you to check your current box for a model number so we can match you to the correct Curt Helux? I have narrowed it down to being a Lippert 1621, Rhino or 11116 and I am thinking it's a Rhino but we would need to verify to be sure. If it is the Rhino you'd want the part # C65MJ that you referenced.
(click to enlarge)
Product Page this Question was Asked From
Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino - 24K GTW - 4,000 lbs TW
- 5th Wheel Pin Box
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 24000 lbs
- Rubber Spring Suspension
- Fixed Turret
- Lippert Rhino
- CURT
more information >
Featured Help Information
Instructions
Continue Researching
- Q&A: Will EcoHitch Front Hitch # EH83GR Fit 2019 Ford F-450
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Q&A: Replacement Flush Valve for a Thetford 42072 Toilet
- Q&A: Recommend 5th Wheel Hitch for a 2019 Ram 3500 6-1/2" Bed with a B&W Turnover Ball
- Q&A: Is Replacement Spring for Curt Helux Stronger Than Stock Spring
- Q&A: Will The Curt Helux C83RJ Fit My 2026 Rockstone Legacy 43BFC With A Rota-Flex Pin Box?
- Q&A: Can B&W Gooseneck Pin Box Replace Curt Helux On 2026 Brinkley Model Z 2680
- Q&A: Fifth Wheel Hitch Recommendation to Use with Curt Helux Pin Box
- Article: The 5 Best Trailer Drop Hitches You Can Buy
- Article: How to Install Truck Air Bag Suspension Kits
- Article: Brake Controller Installation: Starting from Scratch
- Article: 30-Amp and 50-Amp RV Service: What's the Difference?
- Article: Best 2017 Trucks for Towing a 5th Wheel
- Article: Best 2020 Heavy Duty Trucks for Towing a 5th Wheel
Jeff
3/13/2026
Hi James e-trailer really helped me pick the right pin box make sure off the pin weight, 3100# seems lite for a 19000# trailer. if you look the hitches have a little overlap on the weights they suggested to go with the heaver one for me. the specs. on my 40' 5th wheel said 2995# but if you use the calculation of 22% of GVW it came closer to 3800#. I have yet to tow with it on there but looking forward for first time. hope this helps Jeff