They sell wire kits these days to match the vehicle's harness to the radio wiring. All you have to do match the colors. Go into any radio supply store, tell them the year of your vehicle and they...
I bought a wiring harness at a store specializing in all things trailers for my 2000 Montana (they are also readily available on-line). The instructions were so-so, but what you need to find is the...
the depth of the wire is not as important as the type of wire and the connections. you want to put the wire deep enough to prevent accidental cutting from normal activities, 8 - 12 inches should be...