Rubbermaid offers dollies for their Brute containers:
http://www.usplastic.com/catalog/cat...e=24896&Page=1
You should use only white, yellow or gray Rubbermaid Brute containers, especially for storage of R.O./D.I. water, because they meet FDA and USDA specs for food storage. Other Rubbermaid containers may leach chemicals into your water, saltwater or R.O./D.I. water, but especially R.O./D.I. water. This is a topic that we researched to death a few years ago and that recommendation came directly from Rubbermaid.
I found a gray 32-gal Rubbermaid Brute container locally but was unable to find any of the 20-gal size, so I ordered two white 20-gal Brutes from U.S. Plastic.