Hi there
I have good news for you, so that you don't worry about this until you receive your new RV.
We have a 2016 28RKS 5'vr and all things being the same (door width, recliner size) I can verify that your recliner will fit through the doorway.
It will take two of you and navigating through the threshold with the recliner in the 'reclined' position sideways.
We thought two recliners and a small table was just too much for the space by the feature window, so we took one out and put it up for sale.
Now we have plenty of room and it doesn't seem over-stuffed.
Hope that helps allay your concerns.
Cheers
Glen