Choosing Between MORryde Cushioned Pin Box and Curt Flex Air for 2022 Grand Design Reflection 337RLS

Updated 08/28/2025 | Published 05/22/2025

Products Featured in This Question

MORryde Cushioned 5th Wheel Pin Box for 14K to 18K Trailers w/ Lippert 1621 and 1621HD

(255)

$799.99

Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 18,000 lbs

(194)

$1667.21

Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs

(194)

$1782.37

Question:

Hi etrailerI have a 2022 reflection 337 RLS.I want to replace my pin box with a Curt flex air or the Moryde hitch.Could you please let me know which hitch would perform better.Thank you.

asked by: Jeff B

Expert Reply:

Hey Jeff! Between the MORryde Cushioned 5th Wheel Pin Box # MR84VR and the Curt Flex Air # LC328492 the Curt is the better option. The Flex Air features the same rubber compound in the head but has the additional air bag so it is essentially an upgraded version of the MORryde.

Both of these will fit if you have a Lippert 1621 on your 2022 Grand Design Reflection 337RLS. If you aren't sure what the bolt pattern is, feel free to send me a picture of the pin box sticker and I can use that to identify your current pin box. If the sticker is missing you can check out the help article below which explains how to measure and identify your bolt pattern. Let me know if you need anything else.

expert reply by: Robin H

Curt Flex Air
(click to enlarge)

Jeff B.

5/25/2025

Hey Robin H.,thanks for your help.I was leaning more towards the Curt flex air pin box.Your input helped me make that decision.Thanks again!

Robin H.

5/25/2025

@JeffB happy to help!

Jeff

7/29/2025

Hi Robin ,this is Jeff I just wanted to know your thoughts on the 21,000 of.Curt flex air pin box LC65VR for my Grand Design 337 RLS 5th wheel.Thanks.

Robin H.

7/29/2025

@Jeff do you have a Lippert Rhino on there now? Assuming you do the # LC65VR will work. It is rated pretty high compared to your GVWR but that is the only option for the Rhino. You will likely have to keep the air pressure low in the air bag for it to work properly but that isn't a problem.

Jeff B.

8/27/2025

@RobinH. I currently have a factory 1621 pin box.

Robin H.

8/27/2025

@JeffB got it, this was my response from a month ago. You can choose between the # LC328492 from my original answer or the # LC369535 from my response this morning, both fit the 1621. Since you have a GVWR of 13,995 lbs the 18k # LC328492 would be the best choice.