I think most models with the corner bed has the large storage container. The outside storage was very important to us which was one of the reasons we went with that floor plan, but I think every manufacturer has that plan. We also went with a no-slide plan for several reasons, one is the slides really cut into outside storage. We went with a Thor 23h (24'10" by tape measure) and one reason was because it has the largest outside storage we could find. It holds the mounted spare tire/jack/lug wrench, all the chairs and tables, a Yeti 45 and 35, 20" kids bike, cornhole boards, portable fire pit, Coleman Road Trip, full-size 5 gal propane cyl, two milk crates full of sewer hoses and fittings, 120v 2 gal air compressor, and all the spare tool bags all at once. And I'm sure I'm missing some things.
With this length you should have no issues with overloading. We are 2200 below GVWR when fully loaded for a trip, and the front axle is closer to the limit than the back.