Previous posters are correct. If you want a 3 row SUV, get a popup trailer (sleeps 6 easily enough) or a hybrid (pop-out bunks).
Keep in mind that the goal is to get out there and enjoy the outdoors together as a family; anything that enables you to do that will let you build the memories. Even a whopping big tent will do that. Think of whatever you pick out as, primarily, a bedroom on wheels. If you're looking for a complete house away from home, you are likely to be disappointed no matter what you buy, because (1) the quality isn't there and (2) it's going to be crowded as heck inside that trailer.