This tank was developed by Heifer International to help people who have nothing. All of the talk about wagons and such sound like people who have things. A wagon and a bucket will spill as much as it carries, and the wagon would be stolen anyway. Ropes, vines, almost anything can be used to pull this, and I'm sure that if a stick would help they will discover that very quickly. But, a good portion of a woman's time in that part of the world is spent gathering firewood too, assuming there is wood to be had instead of dried dung, so do we devote firewood to do the job, or just use a rope? This is a great idea and has help thousands of poor people transport their water.
Check out Heifer International for more info.