I have the Windsport 34J with the "king" bed. The Denver Mattress is not impressive for an actual overnight sleeping engagement. I went to Costco and bought the 3" Topper they are still on coupon till Sunday 8/27. It is a Cal-King and then you just trim off about 6" off the bottom. I use the left over to keep things from shifting around in my under bay storage. The width is a match.
'16 Windsport 34J
2004 Fleetwood Jamboree GT 31W --- Sold