1987 G.I. Joe S.L.A.M. (SLAM) review

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This is a review of the G.I. Joe Strategic Long-range Artillery Machine or SLAM. Like a little mobile turret it featured quad cannons and ten micro-missiles. First issued in 1987 and re-issued in 1988, it is a common accessory on the aftermarket. But the question many collectors want answered is: what vehicle type is it?! It looks like a towed piece (but isn't) and looks like a rail car (but isn't).