We stay in a category 6, but we're 2 adults and 2 children and it's a tight fit for us. We had barely enough room to maneuver around, and I can't imagine two other adults also!! If you're VERY CLOSE( and I mean VERY) and don't mind bumping into each other all the time, it probably could work. I agree with the other poster, that it would be VERY difficult for 4 adults to get dressed in any sort of privacy.