Paul,
Can't aee anything specific in the rules other than command units can be carried in gunships or dropships, this is for air assaults. They take one space and can only order the unit they are transported in, and there can only be 1 transported in said transport; FAOs & FACs do not count to the 1.
Most commanders otherwise probably don't go around in transport because of the risk of the transport brewing up and them becoming suppressed or knocked out.
To date as I recall we've played they can but treat it as per being carried in a gunship or dropship, so one commander only, moves with transporting unit, issues orders to transporting unit or other unitss in the transport - such as 'Move! Move! Move!'
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