My opinion is that most problems develop over time and a good routine of checking things out is the way to go. I recommend doing as much as the service yourself as possible. At least inspect things. Nobody will pay as much attention to the vehicle as you can. You can easily use a creaper to slide under the truck.
Most components are easily accessible and viewable.
For a 90's vehicle, the systems are basic and easy to diagnose. You can save lots of money by doing the work yourself. While some dealers and independent service shops charge reasonable rates, others try to get you. Well, this is kind of true of most vehicles nowadays. We do not endorse any such activity for others or recommend it to any particular person - we simply describe our experiences and opinions.