What about both things connected with hiding things?
The Rolls-Royce was a way of getting gold out of the country by making the car's panels of gold without anyone noticing that anything unusual was happening; and wasn't the crawler used in 'You Only Live Twice' in which a volcano was used as a cover for launching space craft, and this crawler was used to put the rocket into position? A bit tenuous I know, but isn't that what you said in the first place?!