yep that one is just a 4x4 with a factory off road package. I have one just like it but mine is white, and while not a "special edition" it is not overly common, just like today we have the FX4's, and see them almost everywhere our rangers are just built for running off road. It was not a dealer installed option, but ordered from the factory as it sits. Wheel travel is about 1.5" more in the front then the rangers with 235/75R15's due to a slightly taller coil spring. In the rear they received a set of heavy duty leaf springs.
I wheel mine nearly every weekend, and in stock form it more then keeps up with my friends lifted 99 4runner, and 2007 Tacoma. I have even pulled out a trapped H3 that got in over his head.
Have fun with your truck, and enjoy your tuff truck