As a side note, I raised a question with Herb, whether unarmed or lightly armed APCs counted as "units" in formations like Level IIs. His answer wasn't a declaration of canon, but he pretty much felt they could be ignored.
So for example, you could have a Level II of BA supported by Heavy APCs for organic transport, and still count that as a Level II.
Now I took things a step further in my headcanon, and made up a definition of " lightcarrier" - something with IT, and no more than 1 AS damage at short range, and no more than 0* at medium and long. Provided the light carrier had capacity to carry a designated unit, the pair count as 1 for formation building, and can use either unit's values to qualify.
So for example, the VSP-equipped Shedu is a Juggernaut. 6 Shedu Level Is can make an Assault Level II. Add 6 hover APCs, and they're still potentially an Assault formation, unless you want to use the APC's Scout designation to call it a recon formation. Obviously that has to be declared before the start of the game.
Obviously, if you're using a Palmoni or Magi UCSV ... that's a unit. Call that a "heavy carrier". A heavy carrier still counts, but can sub values for a carried unit. So Palmoni carrying Purifier Terras can 'carry' them into an Assault Lance.
Otherwise it's botheringly difficult to get any advantages from properly combining BA and infantry into Level IIs - and a WoB without mixed Level IIs is hardly worth gnawing through the leather straps, is it?