because I want more power than my idi can offer. on stock tires I bet this thing would run great, but with 37s I can't accelerate up hills that I think I should be able to, and when I hook to a trailor I get a lot of smoke. That can be fixed easy enough, but I'd rather have a 12v and have more power. I'm 21, I want something big and fast that can pull whatever I put on it with ease, and would stand a chance when I go to sled pulls. Fast being relative, I know diesels aren't "fast" without a lot of money, but a 350-400hp 12v will wax a lot of other trucks and some cars.