I took delivery of an Imagine 2600RB on Wednesday, May 5th. We took it camping for Mother's Day weekend. As I was breaking down to leave Sunday, I had some difficulty getting the cap off the drain pipe to empty the black and gray tanks. When I did get it off, sewage immediately started flowing out. It's obvious that the dealer didn't close the valves before they sent me on my way and that's not something I would have even thought to check myself while at the dealer's lot. Although the cap was still difficult to get off a day later, I wonder if pressure from all the effluent made it that much more difficult to open Sunday.

So my question is, is closing those valves something the dealer should ALWAYS do or is this on me? (And let me tell you, it WAS on me!)