You're always going to need to run power and network to your mobile stand.
From there you can look into wireless mics, I agree, Revo makes some of the best out there. Wireless display...I wouldn't count on that just yet. Since you're running VGA to a table, you might as well run the mic along the same track.
For local preso, I would definitely invest in a appleTV and/or Chromecast to keep things wireless