1990 Oshkosh "P-15" 2x1250/6100/500.  The largest ARFF vehicle ever built can lay down a blizzard of foam from its front and rear turrents.  Oshkosh built sixty-six of these massive rigs from 1977 to 1990 for the U. S. Air Force, four for the U. S. Navy, and a handful for civilian use.  These rigs weight 130,860 pounds fully loaded, and its two 492 horsepower V8 engines can accelerate from 0 to 50 mph in 49 seconds.