I also had an 1998 2500 Suburban 6.5 turbo Diesel .
It was a great tow truck, leather and all. At 96,000, and towing a 28" enclosed trailer @ 1000 RPM over redline (chip) with an 1933 RR PII inside. I think the PII was about 7,000 empty. In a slight race with with one of the N.J. trash trucks down a large hill on I70 a little or lot over the posted limit, he won. That trash truck was 100 MPH +.
This was around Weeling WV. It spun a rod bearing. It sounded like a bent push rod, so I drove it to Hershey, Pa & back. When I got back to OH & the dealer pulled the pan it was quite ugly. If I had known it was a rod, I sure would not have drove it another 600 miles. It still ran very strong, but more deisel noise than norrmal. A new engine took care of the problem.