Springsteen does it. The Stones do it. Buffet does it. Melissa Etheridge does it.
I think the trend of having a second stage set up near the back for a few numbers in the middle of the set would be PERFECT at t-ride. Just think about a small stage set up right in back of the sound booth! It lets everyone get an up-close view of the musicians, and gives the artists something really special to look forward to.
The second stage could ALSO be used for the 'tweeners!