With two cab sizes, four bed sizes, four trim levels and a long list of options and available packages, there are dozens of ways to configure the Titan. Every Titan gets the 317-hp 5.6L V8 engine and a 5-speed transmission and it's capable of running on E85 bio-ethanol fuel. Front air bags and anti-lock brakes are also standard. The King Cab can be matched with either a 6 1/2-foot or 8-foot bed; the Crew Cab gets either a 5 1/2-foot or 7-foot bed and rear half-doors that fold flat against the bed sides for easy entry. The four trim levels, from the most basic to the most feature-filled, are S, SV, PRO-4X and SL. The 5-passenger S King Cab starts the model out with 168-degree "Wide Open" doors and a CD stereo. The 6-passenger S Crew Cab adds power locks, windows and rear glass and two more speakers. Both are available as rear-wheel or 4-wheel drive trucks. The SV has everything the S does, plus 18-inch alloy wheels, chrome bumpers and grille, power mirrors, remote keyless entry and 6-disc in-dash CD changer. Like the S, it comes in either rear-wheel or 4-wheel drive. The PRO-4X takes the features of the SV and adds solid off-road capability, such as an electric locking rear differential, Rancho shock absorbers, a lower gear ratio, two additional skid plates, fog lights, bed lockbox, upgraded interior trim and white gauges in the dash. The PRO-4X is only available in 4-wheel drive. The SL takes the features in the SV and adds a load of extras: 20-inch alloys, automatic headlights, spray-on bedliner rear sonar system, 10-speaker Rockford Fosgate stereo upgrade, Bluetooth connectivity, dual-zone temperature control, heated front seats and power adjustable pedals. It takes a few features from the Pro-4X, too, such as fog lights and bed lockbox. All Titans now get Nissan's Vehicle Dynamic Control and side-impact airbags as standard safety equipment. Besides these cab sizes, bed lengths and trim levels, there are several packages of options available for the Titan: Max Utility, Side Airbags, S Popular Equipment, SV Popular Equipment, Heavy Metal Chrome, Sport Appearance, Driver's Convenience and Technology. Most of these packages include features that are standard on the SL version of the Titan, but some, like the Side Airbags package, is optional for all models. It includes roof-mounted airbags, side-mounted airbags and vehicle dynamic control. The Driver's Convenience package substitutes 8-way adjustable front captain's chairs for the standard 40/60/40 split front bench. Bluetooth and the upgraded sound system are also included. In the Crew Cab configuration, this package includes a sunroof too. The Max Utility package makes the Titan into the ultimate workhorse, with spray-in bedliner receiver hitch, 7-pin wiring harness, heavy-duty battery and front tow hooks. The Pro-4X and SL versions of the package include heated tow mirrors in addition to all of the other features. The Sport Appearance Package adds PRO-4X-styling and technology to the 2-wheel drive SV model.