I have an 04 Silverado with 120k that I bought new that has been fairly reliable in areas, fairly unreliable in others. Weak points are brake rotors and calipers, brake line rust, Autotrac transfer case. The engine has been pretty reliable and I've only had to do the water pump once. The transmission may also be a sore spot - mine has been fine and I tow a car trailer fairly often - but I change the fluid pretty regularly which has kept the trans happy. I would worry if the trans fluid has never been replaced.
The shocks on the magnetic ride system are durable and I wouldn't want to replace them as they are expensive. Did you run the codes yet?
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