Space wise for the trailer I've always liked a hybrid. It is part pop up part hard side. Some have slides with them too. Think about how much real estate a bed takes up. That is the beauty of a hybrid the beds fold out like a pop up and floor space is much better. As for the sxs I know it doesn't help because it isn't a toy hauler.
Check out the 21ss floor plan.
Rockwood Roo 21SS Travel Trailers by Forest River RV
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