I had a old 22’ Class A Winnebago, rear bed, mid wet bath next to the kitchen/dining table/living area which was mostly the front seats. It worked for weekend camps but a wet bath and lack of space for water tanks, furnace, oven and stove plus sinks and refrigerator would just be too cramped for most families to live in. Basically they tried to cram an apartment into a 20’ x 7 1/2’ space which just didn’t work. Fortunately most people today have realized simplifying and reducing what works for them allows several advantages, like most van dwellers have come to realize. Those that haven’t buy bigger RVs, having everything with you is great until you can’t set or sleep comfortably which moves the market towards larger RVs with over $130,000 price tags.