A "Now I have seen everything":
Went grocery shopping today in Aurora, CO, and in one long aisle they had a display of 12 galvanized stock watering tanks in a row sitting on wood pallets and filled full of Halloween candy. Never saw so much candy in my life.
How big were the tanks? When I think of stock tanks, I always think at least 8 ft. diameter. Can't get many cows around a 4 ft. one.
This would be an image of one.
(http://i941.photobucket.com/albums/ad256/waldoegray/stocktank_zps5e80e85f.png) (http://s941.photobucket.com/user/waldoegray/media/stocktank_zps5e80e85f.png.html)