Not sure what you are asking. Are you asking about motorhomes where you can access the back end, bathroom, and bedroom with the slides in? If that is your question, there are a lot of them. In my C, I can squeeze past my referigerator to get to the back and sleep in my bed or use the bathroom. Only problem is that when the slide is closed, I can access only the top drawers in my dresser, but I can pull out my bedroom TV and access the top closet. I also can't lift the bed up to get stuff out from under there. So, I just make sure I have everything I will need ahead of time.
When you go shopping, most of the time, at least in a dealer yard, they will have the slides open. Just ask for them to be closed so you can determine if you can get back to things.