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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 correct MORryde Cushioned 5th Wheel Pin Box for a Grand Design Reflections 337RLS is part #MR84VR. This pin box will do a wonderful job of helping smooth the ride due to the internal cushioning which reduces road shock.

While the MORryde #MR74VR is rated up to 18,000 pounds, it is optimized to give the best ride for trailers weighing 11,500 to 14,000 pounds. This will be a very good choice for your Reflection as long as it has the 1621 or 1621HD bolt pattern - which…

The manufacturer and model number of the pin box is usually printed on a sticker or stamped into a plate or directly into the metal of the pin box. If you can't find that, the manufacturer of your 5th wheel should be able to tell you which pin…

The MORryde Cushioned 5th Wheel Pin Box for 14K to 18K Trailers w/ Lippert 1621 and 1621HD #MR84VR is listed as being 190lbs. You'll probably want to have three people to lift the pin box in place and get it bolted, unless you have access to a…

Step 11 of the installation details (which are linked) for the Trailair Flex Air 5th Wheel Pin Box #LC328492 state to: Inflate the air bag with only enough air to raise the pin box to the ride height mark on the front of the shock absorber with the…

Your best option is to drop the psi of the air bag from the Flex Air part #LC328492 down to 45 psi and let it be a little high on the marker. Being 1/8 of an inch off wouldn't be an issue but underinflating the bag could cause it to damage…

The height of the B&W Companion OEM 5th Wheel Hitch for Ram Towing Prep Package #BWRVK3600 would be from the bed to the top of the hitch plate. This is to meet up with the pin box on the fifth wheel so that it rides level while you tow for better…

The MORryde Cushioned 5th Wheel Pin Box #MR84VR weighs right at 190 pounds. Due to this, it will ship freight. Just in case you needed, this is designed to fit 14,000 to 18,000 pound trailers with the Lippert 1621 and 1621HD pin boxes.

I could not really find much with the information provided. The 438277 number and Road Armor pin box did not provide the needed information. What I can tell you is that the 5th Wheel Pin Box Cover #LC301458 fits a Lippert 1621 pin box. If your LCI…

The answer to your question will depend on what kind of surfaces your tow vehicle will be parked on when you hitch/unhitch the trailer. If you are going to find yourself pretty consistently on level, even pavement, then a fifth wheel hitch whose head…

Above-bed hitches are installed on rails that remain in the bed of your truck even when the hitch is not in use. With below-bed hitches, the installation equipment is installed beneath the truck bed, so the fifth wheel hitch simply drops into the…