X3 on a sink. I didn't really think about it but my new stacker came with one and cleaning up in the trailer before going in the motorhome is priceless, keeps the wife happy as well. The sink is plumbed into the fresh water tank on the stacker and drains to the ground. Sink is tied to the same pump that is used to pump extra water to the motorhome. On board air, fuel tanks and filling station are an added plus. Also, in all my trailers I have had a dedicated tool box with everything I need while in the dunes. I keep it stocked with harbor freight tools so no unpacking a tool box between trips. The more tie down points, the better. Seems every trip is different on what needs to get tied down.