I don't know what percentage is right. But I pay $1000-$4000 for my trucks. I bought a Dodge D250 360, 4sp, 3:54 gears with a closed Utility box for $1200. It had 95,000 miles on it. I spent about $1500 to get it into top condition. It now has 120,000 miles runs great. So I believe for me buy...