The unit type of the core unit, Port Drone, is not provided (which is very annoying) and you can't just do "Porter Drone" in the UnitType. However, what you can do is check/target the pod being carried. Have a unit target the pod, then get it's ware type. Using GetUnitSettings to get the table of the pod's settings and specifically looking at the element "Resource" which works as: 0 = energy, 1 = AC, 2 = ARG, 3 = Liftic, 4 = Bluite, 5 = Redon, 6 = Greenar. Link to unit settings 4RPL CW4 wiki:
http://knucklecracker.com/wiki/doku.php?id=4rpl:commands:getunitsettings#tab__podIt is very unfortunate that the "sub-units" of main units aren't provided in the Core Unit Types and again, you can't just look at the name of the unit from the Creeper graph log such as "Porter Drone" and use that.
The pod isn't a sub unit but an actual other unit, hence why we can place Pods on their own in the editor and how they "land" and are used.
The pod mid-travel is very much still a normal pod except it is unselectable and all that other stuff. My Light SAM in VPAC did target flying Pods until they landed as it's listN of exceptions had the wrong number of assigned elements for the list. The Light SAM looked for units and if they had the status "OccupiesLand" set to false, is something that can be targeted if it's not in the listN of exceptions.