I have an '89 with about 160,000 on it. I like it, and it does what I bought it for very well. But mine is a K3500 with a 454, so its a little different than what you are going for.
The 1-ton big block will pull a loaded trailer 80 mph at less than 8 mpg...
But it has never left me feeling my pickup is too small for the job, even with another 1-ton truck on the trailer.
