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Is the suspension all stock or is the Jimmy lowered?
The Jimmys/Blazers are similar to the S10s/Sonoma Pickups. They have vibration at certains speeds if the u-joints or double carden joints in driveshaft are worn. I don't know if those worn joints in the driveshaft can cause alignment and tire wear problems. I don't think so.
I'd say take a look at the front suspension for the wear problems. Something may be worn or broken. Bushings in the control arms, ball joints, tie rod ends, center link, pitman arm and idler arm. I don't know though. If they did an alignment they should have caught any of these problems during the alignment. Maybe try and find a different shop other then the two you've been to already or a dealer to take a look at the suspension.
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