Your Spring De-winterizing Checklist

So for those who are flushing out the lines and the antifreeze. Are you at your house or are you at a campground where you can dump it or do you fill up your gray tank and then go dump it? I figure if you are hooked up to city water you would need to be at a campground. This will be my first season dewintering a trailer. Maybe it doesn't take as much city water as I think. Mine is 21 ft.

Thanks
Jim