well if the forward base has to be located within the spawning range (maximum range/radius that vehicles are allowed to spawn up to when creating a map, not at the preset spawn points themselves) of a friendly base. then they could be resupplied after creation buy vehicles spawning in nearby.
the base must start as a vb only, with limited ability to resupply/launch vehicles from, (i.e. only launch/resupply non-perked light or medium vehicles)
then the next 10 c47 or equivalent cargo in vehicles can bring in enough gear to convert it to a small limited fighter resupply (limited fuel load out no ords)/vb but increased resupply capability for vehicles (can now do all vehicle resupply and spawn some non perked heavier units)
then the next 10 c47/vehicle equivalent can arm the base with AA, radar and increase the resupply capability of fighters, (bombs rockets drop tanks etc) and allow all vehicle spawning/resupply
the next 10 c47/vehicle can then enlarge the base to the size required to launch fighters from directly, and land and resupply bombers
the next 10 c47/vehicles can then complete the base so that it may launch or resupply all vehicles fighters and bombers....base is complete
base may never be capture, only destroyed.......
unless that is someone wants to run about a thousand c47's in and start building a town hahahahaha