4x4 and fully loaded! 8KW Onan generator, solar charger, etc. I added a macerator at the clean out so that its fast and efficient. If you prefer to do it the gravity way you can simply disconnect the hose and use a normal hookup but I prefer this way as its easier and cleaner. I also added thermostatically controlled heaters for the grey and black tanks so that it can be used in four seasons.