Greetings,
Been gone a long time (the more things change, the more they stay the same), so take this with a grain of salt (huge friggen nugget of salt!).
The potential for testing this idea already exists (or did). We have Vehicle Bases, that require troops to take. Hitech tested a 'must take base to take next base' method years ago - I am sure some of you remember it, much wailing and gnashing of teeth on the board. Unfortunately, the test had only one line of advance per country.
I once made a map with multiple vectors for taking the next field (one field led to 2-5 others). This made some bases more 'strategic' than others as the base connected to a larger number of bases.
Remove all vehicle spawn points, all vehicles launch from VHs. Place multiple VBs between the air fields (to simulate towns). How far apart the bases are depends on how far you want to drive, as you can be certain the lead VB hangers will be camped. You take the next base, you 'move' the front lines.
Build the map (I recommend a small one), ask to test it in a special arena.
Regards,