There is no "kit" per se, but I'm sure you can assemble all the necessary parts through eBay and http://www.nissanparts.cc (online Dealership offering discounted prices!).
As far as installation goes, it would probably be similar to setting up an aftermarket fog light setup, with the relays, wiring, and switches, except for the stalk mounted switch vs. the dash mounted switch.
As far as shocks go, since you'll be doing very little off-road, and no towing, there is no need for a heavy-duty shock like the Rancho 9000s or the Old Man Emus. I suggest the Rancho 5000, or even OEM shocks. The KYB Gas-a-just shocks are very good as well, and offer adjustability (not quite to the degree of the Rancho 9000s), but you can still adapt for various loadings in your truck.