Bunkhouse model 5th Wheels

Grand Design has some very nice bunk models, check them out.

The Sandpiper or Sierra 365SAQB has what you are looking for as well. The largest open floor in the bunkroom around.

We really love our Heartland Gateway 3650BH. It has a large double slide bunk room, outdoor kitchen, 1 and 1/2 baths, a Residential fridge, tons of counter space, very good insulation, and 5 slides (430 sq ft).

The Open Range 3X427. With 5 slides, 2 baths, and 3 twin beds in the rear it is the largest feeling 5th wheel I have ever seen. The kitchen feels like you are in a doublewide mobile home. A beast of a fiver but actually weighs less than my 41 toy hauler. A friend has one and FTs in it with minimal problems the first 2 years.

Cedar Creek Silverback should have their looking for.