Most important 5th. Wheel features for full timers

You can actually try several out. Seriously!

I take it you have several you are considering.

Go look again, but this time chase the salesmen away. Then sit in it, look around closely, spending as much time as you feel you need in each one. 45 minutes alone looking around and noticing all the little things that can make that one floor plan be the right one for you.

Then go do it again until you've looked and pretend lived in all the models you are considering.