There are a lot of cart options out there for both single and dual monitor options. You could then add an SX20 and have a portable solution of whatever size you need. Try Googling monitor carts stands and see if you find a cart to meet your needs.
Re: Biggest Cisco Telepresence System on Wheel Base?
As John has said above, you just need a capable trolley and put whatever codec you desire on to it as well.
We've done this before with the All-Metal-Magic and Gilkon Axis trolleys before. The Gilkon ones are good as they have a lockable cabinet on the bottom to hold the codec and any other required equipment.
Note: they're links to Australian web sites, but you should be able to source something similar in your location.
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Wayne -- Please remember to rate responses and to mark your question as answered if appropriate.
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