If you haven't done this be forewarned: dropping these tanks and getting them back in, especially by oneself without help, is a BITCH. With the standard 17" wheels you'll need to jack up the coach at least an additional 8" off the ground to get it out. Blocking and a good floor jack are very helpful. Here's the tank set up (fuel sender removed) after an interior hot-water de-greaser pressure wash. Blew it out with compressed air then let it sit overnight with a small light bulb on to burn off any residual moisture.