Chevrolet redesignated the "C/K" style pickups to the R/V10, R/V20, and R/V30 models.  Trucks in larger weight classes (as well as Suburbans & Blazers) retained the "C/K" look.  To confuse matters even more, some of both types of trucks were included in Chevrolets 1987 model-year production totals.  First year for fuel injected engines.