What Curt Helix Pin Box Is Ideal For 2017 Heartland Bighorn RV That Has GVWR of 15,500?

Updated 02/28/2026 | Published 02/17/2026

Products Featured in This Question

Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino - 24K GTW - 4,850 lbs TW

(14)

$1615.95

Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino - 24K GTW - 4,000 lbs TW

(14)

$1595.95

Question:

Hi, I have a 2017 Heartland Bighorn RV, and wanted to try this new Curt Helux pin box. my RV GVWR is 15,500 that would put my pin weight around 3100 - 3800 was looking at the C63RJ. is this the right pinbox and would it fit my RV, I do have a Lippert frame. thank you

asked by: Russell M

Expert Reply:

Hey Russell,

Since your 2017 Heartland Bighorn RV has a GVWR of 15,500lbs, you'll be right at 3,500lbs Pin Weight. The Curt Helix # C63RJ is really optimized for 3,700 - 4200lbs of pin weight so that's not ideal for your setup. It is also designed for the Lippert Rhino pin box mounting flange. Is that what you have on your camper now?

If so, then you'd want the Curt # C65MJ instead which is optimized for 3,200 - 3,700lbs of pin weight which will be perfect for your pin weight.

If you do not have the Lippert Rhino pin box, then I'll need a picture of the white sticker on the passenger side bracket where the pin box bolts on so I can identify it.

I do think you'll really like the Helix. When I was visiting Alliance RV they were mentioning how it's the only pin box they put on their trailers now due to the road force testing they've done showing how good of a job it does at getting rid of vibrations in the trailer/truck.

What kind of truck are you using to tow your Bighorn?

expert reply by: Samuel C

Russell M.

2/20/2026

I use a Chevy 3500 HD DRW as my TV. I will have to check the type lippert type pin box

Samuel C.

2/20/2026

@RussellM Good truck for that big of a trailer! As soon as you get the model number let me know and I'll get ya the correct pin box part number.

Russell M.

2/20/2026

Per documentation it says it has a 1621 pin box

Samuel C.

2/20/2026

@RussellM Ok, Unfortunately Curt does not make a Helix pin box that fits a 1621 bolt pattern. Due to that there's really two options I'd consider. If you're really a fan of Curt products, they do make an Air ride pin box # LC158778 which is similar however does not have a coil spring like the Helix. If you're fine with other brands, then for the 1621 bolt pattern I would go with the Gen-Y # GY68GR. It does not have the annoyance of airing up the air bag before you tow each time, and does a good job at smoothing out your ride quality when towing.

Russell M.

2/28/2026

I misstated the year of my Bighorn RV it’s a 2015.