A380s are probably too big TBH. IIRC their size and weight limits where they can operate because not all runways can support them. Also fuel is fairly heavy a

A380s are probably too big TBH. IIRC their size and weight limits where they can operate because not all runways can support them. Also fuel is fairly heavy and dense, so tankers are more limited by weight than volume. The classic KC-135 tanker for example can carry around 175,000 lbs of fuel, but the main part of the fuselage is basically empty: https://qph.cf2.quoracdn.net/main-qimg-2638cc62527bd387b0a387130b6503fa https://qph.cf2.quoracdn.net/main-qimg-2638cc62527bd387b0a38...