I'm starting to think about a B

My first RV was a Roadtrek 'B'. Since I'm single, I figured that was enough. And it would have been if 'camping' was why I bought it. But it turned out that I'm a 'traveler/visitor' instead. I often spend a week or more in one spot, visiting what I came to see. That meant hooking/unhooking utilities at least once a day. Spending a week at Colonial Williamsburg was such a pain, that I started staying in a motel while I was there, while driving the world's most expensive van around. BTW, a Roadtrek is too high for a parking garage and too long for a single metered space on the street.
Just depends on how you're going to use it.
I also got tired of the toilet and closet, kitchen and shower, and bed and dinette all doing double duty. That's why the industry makes all kinds of RVs for all kinds of people.