We are, uhhhhh, fluffier than Airstream thinks. It was uncomfortably tight trying to sit at the dinette table in our 17 FC 23FB.
I made some tabletops out of plywood, and tried different sizes until we settled on the size we liked. Then I had a table top made to our specs. It is still 24" wide, but instead of 35" long, it is now 31" long. I took 2" off of each end.
Bobbo and Lin
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
2017 Airstream Flying Cloud 23FB