Txbeaux:
Check out this thread:
Bed Size
A REAL (house) Queen is 60" X 80". Airstream supplied (at least in the Classics) a "Queen" that is 60" X 76".
On the "Island Queen" bed support/frame in the 345, if you let the lower 4" hang over the bed frame (or extend the frame with a piece of plywood) you can fit a "Real Queen" in the bedroom, but that would eliminate the tiny bit of walkaround room at the foot (street side) for making the bed.
Also, you should be aware, Airstream rated the "Classics" on the Chevy P-30 (P-32) Chassis for a total towing capacity of only 2000 pounds.
BTW, we'll be in Tyler State Park the last weekend of Feb. for the Canton Trade Days if you would care to come by to check it out.
Canton Non Planned Ralley