A quick calculation on the various tanker options. With the reload point 15 nm away from the fire the drop rate in liters per hour is about:
AT-502: 140kts, 7,000 liters dropped / hr, hose refill only, price $??m
AT-802: 160kts, 10,000 liters dropped / hr, hose refill only, price $??m
Tracker: 240kts 16,000 liters dropped / hr, hose refill only, price $7m
G111AT: 180kts 16,000 liters dropped / hr, hose refill or scoop, price $15m
CL415T: 180kts 20,000 liters dropped / hr, hose refill or scoop, price $30m
The scoopers can double their output easily if a convenient water body is close because the "tank" time is then reduced to seconds.
There is probably a role for each of these aircraft, but what would the main strike force have to consist of....?
Helicopters.