Buy it cheap, every month you drive it without a note to pay put 1500 dollars in the bank, you will have a nice repair war chest quickly and 1500 in your pocket every month after that. Fix what breaks and roll on. I would 100% immediately change the CP4 to the upgraded model that DOES NOT use the fuel it's pumping to the injectors as lube. It's not if it will fail, it is when, and the stock garbage unit (exact same pump in a Duramax or Cummins also) will pump it's destruction into the injector lines and injectors and that requires replacement of everything. $2000-2400 pump failure now costs $10-12K. If you live where you can get away with it take some of that war chest money and delete all of the stupid off it also. EGR, DPF, Cats, and enjoy the extra power and fuel economy while you pay far less in repairs over the life of the truck.