There is a post form Brian Clemens with a picture of the assembly.
http://www.forestriverforums.com/for...-146079-2.html
We had that problem with our 2018 DX3, Seat would not slide towards center or swivel. I removed the seat, cleaned & lubed the sliding/rotating assembly which is located between the seat & air ride base. Also modified the locking pin assy as it was binding (single side lift on the locking pin).I have some pictures if you would like me to send them to you.