How to Determine the Pin Box Manufacturer and Model on a 5th Wheel Trailer

Question

Question:

I am not sure which pin box I have on my trailer. I have a 2006 keystone Challenger 5th wheel 32TKA. Can you help? I am looking to purchase an air ride king pin.

asked by: Andy D

0

Expert Reply:

There should be a sticker or plate on the pin box itself that lists the manufacturer and model of the pin box. If it is not present then there are some measurements you can take to determine the model of the pin box. I have included a link that explains these measurements for you.

Once the pin box is identified we can determine if there is an air ride pin box that will fit.

expert reply by: Michael H

0

Jose

6/2/2024

I have telescoping 45 degree I want to put different.. but I don't know .. what can I put .. can you help me with that...

Kevin C.

6/3/2024

@Jose If you're wanting to replace you're pin box we'll need to first know what bolt pattern you have. There's typically a sticker somewhere on the pin box or next to it that lists an RPO#, Serial #, and LCI Item #. If this sticker is missing then you can use the attached guide below to measure for your bolt pattern.

Helpful Links

faq-measuring-a-fifth-wheel-pin-box.aspx

David

2/19/2025

@KevinC I have a Lippert 18,000 lbs Rota-flex pin box with the following numbers: LCI 802605 RPO-0005449875 I want to swap to a fifth wheel to gooseneck hitch like the Reese Air Ride coupler. Will the Reese goose box fifth wheel to goose neck air ride coupler work for my setup? Thank you.

Kevin C.

2/24/2025

@David Based on the numbers you provided your Rota-Flex has a 1621 bolt pattern and would need the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR. This doesn't come with safety chains so you'll want to pick up some like the # SHK35MR for added safety in the event of a breakaway. Do you have a long bed or will you also need an offset ball to give yourself more turning clearance?

Helpful Links

tv-review-reese-fifth-wheel-to-gooseneck-adapter-rp85fr.aspx

See All (5) Replies to Jose ∨

Answer 1

I spoke with my contact at Trailair and from your serial number we were able to determine that your trailer came with a 1621 HD pin box which is a long pin box style. I was unable to obtain the exact part number for your Trailair pin box but from the…

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Answer 2

Hey Shayne, yes the Gen-Y Hitch Nomad 5th Wheel to Gooseneck Pin Box #GY57ND that you referenced would need the included spacers to install in place of a Lippert 1716 pin box as that pin box is 1/2 inch wider. What camper do you have? At this time…

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Answer 3

Hey Clarendon, you're on the right track. You’re not wrong in how you’re thinking about this. You’re coming off a Flex Air, which is about as good as it gets for ride quality, especially paired with a B&W Companion. That rotating head plus…

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Answer 4

Mark, I hear you - those heavy manual sliders are a chore. The important thing to know is that the Gen-Y Nomad doesn’t add any turning clearance. It matches the geometry of a standard fixed pin box, so whatever cab clearance you have today without…

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Answer 5

Thank you for reaching out! The MORryde Orbital and U-Turn rotating pin boxes have been discontinued which is why you're having problems finding them anywhere. Even with this being the case, we still have some similar options from Reese that you…

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Answer 6

Hello Mark. Are you trying to determine the pin box size for your camper? Unfortunately, RV manufacturers do not list this information online, so there is no way for me to look this up. A Jayco dealership should be able to provide this info.…

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Answer 7

Hello Levan, thanks for reaching out. Yes, the Gen-Y Hitch Nomad 5th Wheel to Gooseneck Pin Box #GY57ND is made to replace the Lippert 1621 pin box so the bolt hole spacing and dimensions are the same. Your cab and tailgate clearance will be…

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Answer 8

Pin box bolt torque is based on the size of the bolts. 1/2 inch Bolts GR5 90 ft-lbs 5/8 inch Bolts GR5 150 ft-lbs 3/4 inch Bolts GR5 275 ft-lbs

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Answer 9

Pin box bolt torque is based on the size of the bolts actually. 1/2 inch Bolts GR5 90 ft-lbs 5/8 inch Bolts GR5 150 ft-lbs 3/4 inch Bolts GR5 275 ft-lbs

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Answer 10

Hello David. The torque chart in the instructions refers to the diameter of the threaded portion of the bolt, not the head. So, while the head may fit a 15/16" socket, this is not the size of the bolt itself. Please do confirm the size of your…

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Answer 11

The Ram OEM 5th wheel puck system, shown in the linked photo and article, was launched in 2013 so what you have in your truck is likely to be an aftermarket installation of some kind. These newer Ram trucks with the factory prep can directly accept a…

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Answer 12

Hey Chip, If your Gen-Y Executive 5th Wheel to Gooseneck Coupler has the SnapLatch feature you can use the InfiniteRule Lock for Gen-Y Hitch SnapLatches #IR48FR. If you have the older model without the SnapLatch you would need Gen-Y's GH-8111…

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How to Determine the Pin Box Manufacturer and Model on a 5th Wheel Trailer

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