What Rigids are you running? It does make a difference whether they are Duallys D2, 10", or 50" and how many lights on one circuit.
Look at the chart on the right. I would say if you have a 4 door, you are looking at about 15' or so. If they are Dually D2's, figure they come with a 10 amp fuse, then according to the chart 16AWG minimum. These are just close approximates. It does not hurt to go one gauge size up.
Also, another good trick is to use your frame rails as a conduit for all your cables, coax, airlines, wiring Etc....it's the perfect out-of-the-way conduit!
Call or email me and I will send you one of our tips-n-tricks trifolds for future reference.
As far as wire goes, you want to use a multi-strand copper wire with good insulation. Like the guys said above, you can go to Walmart, go into the auto section, go to where the trailer accessories are and pick up a roll of trailer wiring. it's 4 conductor, Yellow, Brown, Green and White. You can find it in 14AWG as well as 16AWG. pull it all through the frame and leave the extra there for other electrical goodies!
-John the sPOD guy
switches jeeps panels jk-forum carling contura led switch windshield