I have used one of these for about 5 years, I got mine from Bass Pro. However, I did have to make some changes to it. The ring prevents wide pots from being use, I cut it off and welded 3/4" angle iron to the extensions to fit wider pots. The next problem is that this was not intended to support that much weight. It was starting to wobble with 5 gallons and 10 gallons was down right scary. I welded some of the 3/4" angle iron vertically from the extensions down to the base, I did this for every other one, 3 total. Now it is rock solid and hold 15 gallons easy.
This is the only picture that I have of it at the moment but you can get the idea from it.