My '98.5 turned 20 last February 11th (it's almost 21). I have had it for almost 7 years. Love it a lot. It's a bit rare, being a Club Cab 24V, which is what I specifically wanted. At 244,000 miles the cab and chassis are still rock solid, nice and tight. My truck has been a bit of a bear the last year, though. It has always been reliable but suddenly it was one thing after another. Power seat died, alternator died, door locks became intermittent, my fairly expensive lift pump died, and then a bizarre starting problem surfaced a couple months ago. Also the original automatic transmission, which has always shifted perfectly, the TC suddenly started locking/unlocking like crazy. Really badly. Then it suddenly went away. Who knows.
I run Weld Evo 20 inch rims that took an ETERNITY to locate. They are 20x9.5" with +22 offset, which I wanted to keep them tucked inside the wheelwells. They were only produced for 2-3 years back around 2005, finding good ones now is almost impossible, but I like running 295/45/20s.
The other thing about my '98.5 it is the equal length tubular exhaust header. Contrary to popular belief it did not hurt low end performance one bit, but definitely helped higher end breathing. Also, it has been on for 90k miles and zero issues (I bought it used).
Lastly, I managed to install a CR Air Boss intake plenum on my truck. Since it's raised up and designed for the CR it took a little effort to install it, which meant bending some of the injector lines a bit and removing the fuel filter canister, which I was planning to do anyway. Did it make a noticeable difference in breathing? Not really, probably wasn't worth the cost and effort! That's the joy of BOMBing, I guess.