Well, there are some things to check on them when looking to buy. Oil leaks at the rear of the intake. Oil leaks at the remote oil filter. Front boots like all 4x4's. Seat recliner handles as mentioned, my drivers side just now broke, trucks got ~34k on it. I haven't had any problems with the spare tire carrier though. Look at the rear leaf springs, or rather how much lower the vehicle is in the rear than the front. Seems they used the same springs on the Blazers as the p-up trucks. Over time, the springs get weak and the rear end droops. Take a yardstick and measure from each fender flare to the ground at the center of the wheel to get an idea. Oh, there have been problems with the pc board in the wiper module on the fire wall. Bad solder joints on the connector it sounds like.
Other than the above mentioned, I love mine. Bought it new and have about 34k on it. Gas mileage sucks, but oh well. It has been a pretty solid truck. Mine hardly rattles like some 4x4's do. Even with the big tires, the 4.3 engine does pretty good at keeping up with traffic. It's great in the snow.
I've been looking at trading it in on an '04 early next year. Looks like '04 will be the end of the 2 door Blazers as they now are...
If you have any questions, PM me...
Wanna buy it
David