I wouldn't be surprised if when we rest in a city, the 'camp' will just morph to look like the room of an inn. Larian doesn't seem to be big on providing much atmosphere to the game in the service of verisimilitude. I don't think they feel it's important. I guess requiring the player to physically walk to an inn and buy a room for the night might be too much to ask of a 'modern gamer'?