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The trailer has a hose reel at the right side under the tank, next to it is a sticker with control buttons. The Exxon logos on the truck and the minifigure are stickers as well. The slogan "Happy Motoring!" is written on the sides of the trailer.
This set was only available in the US, since Exxon-labeled sets were not released in Europe, just as Shell sets were not released in the US until 1986. It was a variant of 6695 Tanker Truck from 1983, which was basically the same truck in Shell livery.