wthibeaux wrote:
Would this work. Get an auto or truck innertube. Remove the valve stem. Put top of tripod through the hole and drape innertube over legs of tripod. Fill the innertube with water. Put valve cap back on. Of course, you will need some way to fill the innertube.
Yes, it would work, but the implementation could be a problem. First, as you noted, getting the water into the tube is an issue. The next issue would be getting the water to flow evenly into each of the three segments, to avoid pulling the tube out of position as it fills. Emptying would also be a slow process. None of the issues are insurmountable, but given the number of other easier to manage solutions, it likely isn't going to be worth the effort.