Smudge,
I used to operate the Herc tanker out of ASI for the airbridge, only it was to Stanley in my day, not MPA. Four extra fuel tanks plumbed in and mounted in the cargo bay of the tanker, I believe they were old long range Andover tanks, but am happy to be corrected. Total fuel load I think was 62,900 in normal tanks and 28,000 down the back....
As you say, happy days in concertina city, the exiles club, a bungalow in Georgetown, and, towards the end, travellers rest or whatever it was they called the purpose built accommodation....