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With regard to 1988 light-duty GM trucks, R/V refers to the older square body design, whereas C/K refers to the subsequent (newer) body style.R = RWD / 2WDV = 4WD
4WD became V in 87. Prior to that it was K. So you're saying that in 87 the C became R?
So the truck that I'm looking at is an '88, but it's a crew cab square body. The only squares that I know of after 87 are the K5s.
I remember when I used to service these back when they weren't very old. The R/V vs C/K designation was very confusing for the parts stores when getting parts. Say you needed a water pump for your 1988 Chevy 1 ton cab and chassis. If it was a square body it was an R series. If the parts guy at the local parts store looked up the part and gave you a pump for a C series you would have gotten a reverse rotation pump that physically looked identical but it would have not worked and overheated. I had to "school" most of my part suppliers as they had no idea what an R/V series was.