Looking For 5th Wheel To Gooseneck Conversion For 2021 Heartland Bighorn 33RKS

Updated 02/20/2026 | Published 02/18/2026

Products Featured in This Question

Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box - Lippert 1621/1621HD - 30K GTW - 4.5K TW

(267)

$1802.16

MORryde GooseTech 5th Wheel to Gooseneck Pin Box for 11.5K to 14K Trailers w/ Lippert 1621

(1)

$1533.93

Shocker Hitch 5th Wheel to Gooseneck Coupler Kit w/ Demco eZ-Latch for Lippert and Rhino Box - 24K

(23)

$1699.98

Question:

Hello, Im looking to purchase a 5th wheel to gooseneck conversion for my 2021 Heartland Bighorn 33RKS and need some help confirming the specific version I need to get. I believe its the 1621 but not 100. Could you link a few different kits as well? Any help that can be given is much appreciated!

asked by: Rusty S

Expert Reply:

Hey Rusty, thanks for reaching out. I can help with that. We do have a few goosebox replacement for the 1621 pin box. My favorite is definitely the Gen-Y, but I will go ahead and list a few option for you:

- Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box - Lippert 1621/1621HD - 30K GTW - 4.5K TW # GY38FR

- MORryde GooseTech 5th Wheel to Gooseneck Pin Box for 11.5K to 14K Trailers w/ Lippert 1621 # MR37MV

- Shocker Hitch 5th Wheel to Gooseneck Coupler Kit w/ Demco eZ-Latch for Lippert and Rhino Box - 24K # SHK99YR

All of these will replace the Lippert 1621 pin box and are appropriately rated for your campers GVWR. My preference is definitely the Gen-Y. They are super durable and help a ton to smooth out the ride. Plus no maintenance like the shocker hitch with air bag.

If you are unsure if you have the 1621 or not, I can help you confirm. There should be a sticker on the pin box that has the model number, RPO number and serial number. If you want to send me those numbers, I can confirm the pin box size and make absolutely sure you are getting the right thing.