Well I can match your 42 in a twotter - ex POM - yes they did check their wireless wasn't faulty. 18 in a BN2 ex Kiantiba - memory dims but 16 in a C402. 22 plus 'stuff' in a 404 ex Tokua on the day the volcanoes let go.
Just about the dumbest thing I ever did was 2000kgs (actually 40 bags so may have been more) of coffee ex Heiwini in RDB - + 50kg cargo boi sat on top the cargo net - come to think on it that was probably the 50kg that made ALL the difference - isn't it ALWAYS the last 50kg