My steering wheel shakes and it seems like my tires are getting wore out quick..Can anybody make a suggestion. I have purchased over 4 to 5 tires in the last 12 months.

Your front wheels are not balanced. Ask your tire dealer to balance your wheels.

Sounds like a bent wheel or a tire out of balance - one of the front tires/wheels. The shaking happens when you get to a speed that causes a sympathetic vibration in the suspension or steering joints. If there doesn't seem to be any vibration or back and forth movement of the steering wheel at slower speeds, I'd lean toward the tire being out of balance.

Either a bent rim, tire is out of balanced and tire is bad. Rotate the tires and see if it goes from the wheel to the seat. If you can feel it in the seat then it's a bad tire.

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If you think the tyres are in reasonable condition get the wheels balanced. If the front tyre/wheels are out of balance you get shake in the steering wheel at certain speeds. Backs out of balance are usually felt through the seat.
I cant see a connection between the power steer fluid level and the gear shift.

Sounds like you need another shop, Most of the items that would cause your problem should be found by the shop alignment tech. Some things to check, tires: mismatched size or type, separating belts. bent, warped or unbalanced wheels, steering box play (internal slop), loose steering box from frame, congealed fix a flat in one of the tires, worn out or broken shocks, loose wheel bearings, problem could be in the rear tires and felt through the seat. if shimmy is while braking , your rotors will need surfacing or replacing. Not a lot of info was provided. 2 wheel drive or 4, big tires or stock, how quickly did problem start... Good luck

1) Take car to non dealer shops willing to give FREE opinion

2) Not likely you have a shock in Driver Front wheel, more likely a strut. Not likely strut needs to be replaced, but strut has a STRUT MOUNT (3 bolts of which can be seen when opening your hood) below this it is connected to STRUT BEARING which below it connects to UPPER SEAT OF STRUT or SPRING INSULATOR, that if loose will rattle. Usually, shops will not tighten, because to tighten is same labor as replace the parts. (Since you already dropped $1000 on ToyotaDealer, ask them to tighten FOR FREE since rattle is still there.)

3) There is a part called a "link," connects strut to stablizer bar, that if bushings are bad will rattle.
4) If stabilizer bar bushing(s) bad, will rattle early on but eventually clunking
5) Bad ball joint or tie rod can rattle as well

Never permit any shop to do expensive work on your car w/o first getting a second opinion somewhere else first. Do not tell second shop that you are there for a second opinion.

Shaking steering wheel at highway speed, no braking
1) Bad tire in front, bad tires in front, verify inflation of tires
2) Wheel alignment may be out
3) Front suspension parts (mentioned several above)

Highway speed to suddenly braking shakes steering wheel
1) Front brake rotors need to be inspected for warping
2) Test calipers on empty road at 40 mph, going straight on very LEVEL ROAD, hit brake pedal SOMEWHAT hard while barely touching steering wheel. If car jerks to one side, instead of braking straight on, you may have a caliper, ABS, or brake fluid pressure regulator off.
3) If brake rotors are warped, may as well replace front brake pads at same moment. Use ceramic.
4) When you drive on VERY LEVEL road on highway, steering wheel must be centered, let go lightly of steering wheel. Did car stay in middle of lane? No? Get a 4-wheel alignment.

OK, when the ABS module is unplugged, the same results. That tells me that the ABS system is not working properly.
Did they look into the master cylinder and other abs related components?
Any ABS codes on it?

If steering wheel shakes above 50 mph that's likely to be the tires on it, rather than a brake problem.

Have tires balanced and rotated and inspected for out of roundness that might cause vibration above 50 mph.

mabey your axle's bent and the old tire wore to it under brake would be rotors

Do you fell the steering wheel shaking or a pulsation in the pedal?

i had the alignment done about six months ago at the dealership. Would they have been able to align the car if something was bad? Not sure how they deemed the new tires bad, but they said they moved the tires from left to right and front to back and could control the shimmy and shake. this has went on for about a year. I dont believe the new tires the first time were bad, i believe the rim was bent. I dont know what to do. These tires have about 10000 miles on them, have been balanced twice, a rim was replaced due to them saying it was bent, but yet, the vibration starts at about 55 and gets worse as you gain speed. Can even feel it in the passenger seat in the front as well. Steering wheel shakes. You can actually see your hand shake while you are driving it, but then at times, it seems to go away and start again. Thanks for any suggestions.