5th Wheel Hitch Options for Towing w/ a 2021 Ram 3500 w/ an Auxiliary Fuel Tank

Question

Question:

2021 Grand Designs Reflection 337RLS towed by a 2021 Ram 3500 with tow prep. want to add an aux. fuel tank, but wont fit with current Anderson Aluminum hitch. Not sure which hitch to change over to

asked by: Ronald A

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Expert Reply:

It sounds like you currently have a hitch like the Andersen Ultimate Connection 5th Wheel Trailer Hitch System with Adapter - 20,000 lbs # AM3200 and you won't have enough space after adding the auxiliary fuel tank. Assuming that is the case, the only option you have is to switch out your pin box.

You can use something like the Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box # GY58GR you looked at, assuming you have a Lippert 1621 or 1621 HD pin box on your 2021 Grand Design Reflection 337RLS.

However, in order to avoid any potential warranty issues, I would recommend the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR instead.

The # RP85FR will fit if you have a Lippert 0719, 1621, or 1621HD. If you have the Lippert 0115, 1116, or 1716 you would need the # RP94716-61301 instead. Any of these will allow you to tow your 5th wheel using the gooseneck hitch like the # BWGNXA2062 with your 2021 Ram 3500,providing you with additional room in the bed of your truck.

If you aren't sure which pin box you have, look for the sticker on the pin box identifying it. If the sticker is worn or missing, you can contact the manufacturer with your vin number. If neither of those works, you will have to measure your bolt pattern to find out which pin box you currently have.

I have attached some review and installation videos, along with an article explaining how to measure the bolt pattern on your pin box for your reference.

expert reply by: Robin H

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Answer 1

Thanks so much for including pictures of your setup! We confirmed that the brackets that you have for your provided serial number correspond to a 1621 Lippert bracket. With this bracket setup and the fact that you are going to add additional…

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Answer 2

It is certainly possible for the Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box #GY58GR to work on your 2020 Ford F-250 Super Duty short bed, but there are likely going to be clearance issues as these are meant for long bed trucks. That…

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Answer 3

The instructions for the Demco Recon Gooseneck-to-5th Wheel Trailer Hitch Adapter #DM8550045 state that the ball socket in the base needs to face the cab of the truck meaning you should not turn it around the other way. Most gooseneck hitches have…

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Answer 4

Yes, we would just need to know the bolt pattern of your 5th wheel's pin box to determine the correct replacement gooseneck pin box. For example, if you had a 1621 bolt pattern (most common) then you would need the Gen-Y Hitch Shock Absorbing…

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Answer 5

Thanks for the picture! That is exactly what I need to confirm what pin box your Forest River Shasta Phoenix 28RB has. I just spoke with my rep at Lippert and you have a 1621 pin box with an 18,000 lbs capacity. You will want the Gen-Y Hitch 5th…

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Answer 6

After speaking with Lippert to ensure a proper fit they confirmed that the Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box #GY58GR will have a matching bolt pattern to your current 1621 pin box.

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Answer 7

The Lippert Underchassis Double Bin Storage Unit for RVs #LC236558 is a better option for your frame. It is exactly designed to fit your 70.5 inch chassis. I've attached a photo and video to assist.

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Answer 8

We have previously confirmed with the manufacturer that the Demco Recon Gooseneck-to-5th Wheel Trailer Hitch Adapter #DM8550045 will only work with a gooseneck ball that is flush to the truck bed. So you will need to use the standard 2-5/16"…

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Answer 9

The Gen-Y #GY66FR shock absorbing 5th wheel to gooseneck pin box you'd looked at is a compatible replacement for your Lippert 1621 pin box. The Gen-Y replacement has a 25K towing/ 5.5K pin weight capacity, which sounds like it's more capacity…

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Answer 10

To determine if the Lippert Underchassis Double Bin Storage Unit w/ Spare Tire Carrier for RVs #LC125460 will be compatible with your 2014 275ULSBS Work n Play trailer you'll need to measure the chassis to ensure the mounting brackets line up…

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Answer 11

The Demco Recon Gooseneck-to-5th Wheel Trailer Hitch Adapter #DM8550045 referenced in your question uses a coupler at the base to securely attach to a standard 2-5/16 inch diameter gooseneck ball. Top and side coupler bolts hold it in place so that…

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Answer 12

The base on the Demco Recon Gooseneck-to-5th Wheel Trailer Hitch Adapter #DM8550045 measures 28 inches front to back and 30-1/2 inches side to side. I have attached an image with these dimensions labeled.

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5th Wheel Hitch Options for Towing w/ a 2021 Ram 3500 w/ an Auxiliary Fuel Tank

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