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The most common thing that causes shaking between about 60-75 MPH is your tires being out of balance. Try having them balanced and MOST LIKELY the problem will go away. Other things that could contribute to this, but are not usually the main factor are, 1) bent rims/wheels 2) tires are out-of-round. As for the hubcaps causing a problem like that, hmmm....interesting I have never heard of that before, I guess it is possible, but seems rather odd.
As for the other suggestions, Alignment will NOT cure this problem as the alignment changes angles of the tires. This means that it will affect 1) Tire wear (Toe In/Toe Out) 2) Tire wear (Camber Positive/Negative) and 3) Pulling left or right (negative cross caster/positive cross caster). An alignment will not cure a vibration as it has nothing to do with that. Bent suspension components tend to lead to a messed up alignment though (bent/broken parts/frame/etc.), usually they do not cause the vibration that you are feeling, but I guess if something is loose under the car it could cause a vibration, but usually associated with that will be a noise.
My suggestion would be to get the tires balanced and then go from there. If you have a bent rim, the shop will/should tell you about it.
Tim '95 SE
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