I thought TRD still made the supercharger kit for the 4.7. Since you brought it up, I looked and couldn't find any supercharger for any UZ-FE engine. I found some discussion about a weakness in the stock block and stock rods in this series of engines (at least the 2UZ-FE and the 3UZ-FE) that may make them a poor choice for installing a sc. Read some of the discussion here:
http://www.lextreme.com/