I guess 'mixed feelings' isn't a good answer... I am honestly not sure how to address the 'Healing Cart + Commando' conundrum. I would like to see the Guerilla be a more stealth like troop. Maybe give him a 4 or 5 radius where defenders beyond that circle don't detect him? Units close by will respond of course.
As for the Healing Cart/Supply Truck, the more I think about it the more I feel it should only heal Guerillas if they are in range. They should not go out of their way.