Actually, it was Charles Lindburgh who showed that it was possible to load the 2000lber plus another 2000lbs of ordnace on the Corsair. He actually flew it into combat...4000lbs of ordnance on the F4U. I don't know what the exact loadout was off the top of my head, but the centerline held a 2000lber.
He also showed Corsair and P-38 pilots how to wring the best possible speed, distance and fuel conservation out of their aircraft.