Flex Air or Air Ride Pin Box with Companion 5th Wheel Hitch

Question

Question:

Flex Air or Air Ride pin box. I have a Grand Design Solitude 360RL 5th wheel 39 with a Roto Flex king pin. I need 2-3 inches more king pin drop to raise the front of the 5th wheel above the pickup bed rails, so am considering replacing the king pin with either of these 2 models. I have a Companion hitch. Which model would be most beneficial? Since the Companion already has the pivoting head, is the Flex Air necessary? Would it provide too much pivoting? I also tow a 6000 lb boat behind the 5th wheel legal in Montana. Thanks for any input.

asked by: Darren R

0

Expert Reply:

One thing to ensure is that your Companion hitch is at the tallest height setting. This could provide an easy solution for connecting your king pin.

I spoke to my contact at B&W, who confirmed that your Companion is compatible with both pin boxes. I also spoke with Trailair, who said that the Flex Air would provide you with over 6 inches in additional height. The Flex Air would also be the best option for eliminating chucking and creating a smoother ride.

We offer the Flex Air pin box for model number 1621 pin boxes in both 18,000 lb and 21,000 lb capacities. The lighter capacity can be found here: # LC328492. The heavier capacity can be found here: # LC369535.

I've attached a demo video of the Flex Air for you to check out.

expert reply by: Amber S

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Answer 1

If you did leave air in the bag of the Trailair pin box like part #LC369535 it wouldn't be a big deal however, we do recommend to deflate the bag to keep the pressure off the bag and fittings while it's in storage. You definitely want…

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Answer 2

Thanks for the photos. We do have the Replacement Decal for Lippert Components Trailair 5th Wheel Pin Box - GVW 21,000 #LC157285. We also have the Replacement Decal for Trailair 5th Wheel Long Style Pin Box - Driver's Side #LC157268. The…

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Answer 3

The Trailair Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs #LC369535 will have an air bag pressure range between 20 and 120 psi. Lippert techs say that sticker is there to assist but is not always accurate due to the fact it is a sticker…

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Answer 4

That's a good question, and yes, the two are compatible. The type of gooseneck adapter that cannot be used with the Flex Air are adapters that attach to the pin box. So you can use the Companion with the Turnoverball rails and Flex Air set…

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Answer 5

The Trailair Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000lbs #LC369535 has 3" difference from king pin to front bolt row when compared to a standard 1621 pin box so it will be that much closer to your tailgate and sides. This will slightly…

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Answer 6

The Trailair Flex Air 5th Wheel Pin Box #LC328492 is a direct replacement for a Lippert 1621 pin box and Lippert has told us that if you match the bolt pattern from your current 1621 the king pin height on the Flex Air will be the same so it will not…

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Answer 7

The king pin on the Rota-Flex pin boxes does pivot and if you are parked on uneven ground then it is possible that the hitch jaws are bound up some. Moving the truck and trailer to level ground or even pulling forward or backward a little could be…

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Answer 8

Yes, it is true that most types of 5th wheel to gooseneck adapters will cause stresses on the trailer's frame and in some instances may actually void the warranty on the trailer frame. However, there is one type of 5th wheel to gooseneck adapter…

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Answer 9

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 10

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 11

Great question, Jeff! When the Rota-Flex first came out it renovated what a pin box could do and be, but at this point in time that technology is a little more dated and the Gen-Y Hitch Shock Absorbing 5th Wheel Pin Box #325-GH-8040 is the "new…

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Answer 12

From what I could find it looks like your 122R (red) and 122Y (amber) lights measure 3.75" x 1.70" x .81". We don't have any replacement lense directly for the GLO-BRITE lights but we do have some similar lights that you could use…

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Flex Air or Air Ride Pin Box with Companion 5th Wheel Hitch

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