Copper wiring questions

How many cars do you haul and how much spare time do you have? From experience on the low end you can get $30 extra out of a car. We have gotten over $300 in a week just from wiring. The main wire is behind the dash and at first sucks to get out and some are harder than others but like anything you can figure it out. I only quit getting the wire when I couldn't keep up with my calls. Also I have never seen aluminum wire in a car, not saying it doesn't exist I've just not seen it. Don't bother stripping it take it in as is.