As with life, variety is the spice of trucking these days. Pickups, particularly full-size, come in more shapes, sizes and capacities than any other kind of vehicle.The Chevrolet/GMC Truck C/K Pickup, Ford?s perennial rival in the sales derby, provides an excellent example of this product proliferation. Regular cab, extended cab, 4-door Crew Cab; regular bed or long bed; manual transmission or 4-speed automatic; 2-wheel drive, 4-wheel drive; dual rear wheels; several wheelbases; engine options galore; a blizzard of convenience goodies - if Shakespeare were writing today, "As you like it" might very well have been devoted to the American full-size pickup phenomenon.