"oh look, your lordship, there's a band of scruffy looking men following some other scruffy looking man around, well armed and all."
"kill the lot of them, bandits no doubt."
At first I lol'd...then I thought about it. Imagine the adventurer class with a subclass "brigand/bandit". It would allow advy's a chance to hurt realms (instead of always helping). It's a rather neat thought.
As far as regular advy's running around with units, seems unnecessary. I kinda assume that is all covered under 'adventuring/sword-fighting gear'. Pack-mules, armor, idiots who are willing to follow some vagabond who fights monsters.