We’ve struggled with the “extra” couch cushion in our 400, and maybe others have already figured this out, but I found an acceptable solution: set it behind the door-side back cushion. It fits the space and the curve of the front wall perfectly. You do give up some seat space, but not too bad really.
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One is at the head of the rear bunk, makes a cushion you can lean against when sitting up in the bunk to watch TV or read.
The next is inside the hanging locker (closets), fits along the right side nicely, and out of the way.
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2018 Nissan Titan Pro 4X "Big Bird"
Leadville Colorado
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Towed by a white 2017 4x4 Nissan Titan XD Pro-4X, 5.0L Diesel, aka Prometheus
2019 Subaru Ascent