You are right, It's a $420 option. But the 2 XL trucks looks vastly different with / without the FX4 option
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You get a lot with the FX4 package:
17" Alloy wheels, Tuned off-road monotube shocks, off-road tires with aggressive tread and traction-enhancing electronic-locking rear differential. There’s also an exposed steel front bash plate, skid plates for the electric power-assist steering (EPAS) electric motor, transfer case and fuel tank. And inside, a cluster screen provides feedback on pitch and roll plus steering angle. Included also are the Terrain Management System™ and Trail Control™ providing off-road technology.
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