Question for the Jones: I have a 2004 Chev DuraMax 2500 diesel. Paid for. 145,000 miles, injectors changed at the obligatory 100,000. 4-5 yrs ago .LB 7. Put new tires at 125,000.Basically no heavy or towing the last 3-4 yrs..or before for that matter(perhaps small boat or Ranger). Only use for...