Can Trailair Flex Air # LC328492 Replace Lippert 1621HD Pin Box on a 2017 Jayco Seismic Wave 355W

Published 11/01/2018

Products Featured in This Question

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

(203)

$1713.22

Demco Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 18,000 lbs

(768)

$1915.00

Demco Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 21,000 lbs

(768)

$2310.00

Lippert 1621HD 5th Wheel Pin Box - 18,000 lbs

(78)

$618.05

Curt Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs

(94)

$1557.24

Question:

Do I need the long or medium since I have the Demco 21,000 lb auto slider ?

asked by: MICHAEL S

Expert Reply:

You are on the right track of choosing an upgrade for the Lippert pin box on your 2017 Jayco Seismic Wave 355W. Since the pin box is a 1621HD instead of a regular 1621 you need to go with a different pin box as the Curt Flex Air # LC328492 is only compatible as a 1621 replacement.

If you like the Curt line then you can use the Curt Air Ride # LC158778. This is rated for 21,000 lbs and the only difference between this and the Flex Air is that the Flex Air has a pivoting head which further helps do reduce chucking. The Air Ride still uses the scissor motion, air bag, and built-in shock that does a great job of increasing your ride quality.

This pin box is actually better if you are already using an autosliding hitch as that pivoting head causes the Flex Air to be incompatible with our Demco Autosliding 5th Wheel Hitches like parts # DM8550034 and # DM8550035.

expert reply by: Jon G

Michael S.

11/1/2018

Do I need the long or medium since I have the Demco 21,000 lb auto slider ?

Jon G.

11/1/2018

The Lippert 1621HD # LC1191151 measures 17-3/4" from the front row of bolt holes to the center of the king pin. Since the Trailair Air Ride # LC158778 measures 19-1/2" for that same distance you won't need to look for a different length pin box if your current setup provides you with enough cab clearance.