The Silverado Classic is available in three different cab styles (regular, extended, and crew cab), and three different bed lengths (5'8", 6'6", and 8'). The regular cab is only available with standard and long boxes and the crew cab is only available in short and standard boxes, while the extended cab is available with all three beds. Engines available on the Classic range include a 195-hp, 4.3-liter V6; a 285-hp 4.8-liter V8; and a 295-hp, 5.3-liter V8; along with a high-output 6.0-liter V8 on the SS model. Silverado Classic models with the 5.3-liter V8 have FlexFuel capability and can accept either gasoline or any combination of ethanol up to 85 percent. The performance-oriented Silverado SS Classic is offered only as a 2WD extended cab with short bed, and packs a 6.0-liter V8 making 345 hp and 380 lb-ft. That same engine is also available as part of the towing-oriented Vortec Max package, which includes a heavy-duty axle, automatic locking differential, and other heavy-duty towing accessories. Payloads rate up to 2,052 pounds, for the regular cab and long box combination, while towing capacity is rated as high as 10,400 pounds with the extended cab, standard box, and the Vortec Max package. There's also a version that comes specially equipped for off-roading. The Z71 Off-Road package, which is available on half-ton 4WD models in LT trim, brings high-capacity gas-charged shocks, jounce bumpers, stabilizer bars, skid plates, and wheel flares. The Hybrid Classic uses the 295-hp, 5.3-liter V8, hooked up to a system that automatically stops and restarts the engine at stoplights, and uses an integrated starter/generator that starts the engine quickly and provides power to charge increased battery capacity. The Hybrid posts a city fuel economy improvement of about ten percent and serves the added function of being a mobile power source. Four 120-volt AC outlets are located under the back seat of the cab and in the pickup bed, and at 20 amps are robust enough for most power accessories, eliminating the need in some cases for a portable worksite generator. The Classic is available in many different trims, from the stark, basic work truck to the mid-range LS and the high-end LT, which can range from well equipped to downright luxurious. The LS adds popular equipment like air conditioning, a CD sound system, and upgraded appearance details inside and out, while the top-range LT3 adds heated power leather seats with memory setting, dual-zone climate control with rear vents, steering-wheel-mounted controls, and a six-disc in-dash CD changer among the many extras. Anti-lock brakes are standard on all models.