There are all sorts of things that can cause a car to shake. Needing an alignment is just one. There could be a tire out of balance, a bad spot in a tire, even a tire that is low on air pressure. Check all of these before you spend the money on an alignment.
Steering wheel shakes
You need an alignment.
you will need a front wheel alignment
Check your wheel bearings, or you might need a wheel alignment
At least every 30,000 miles. If you let go of the wheel and your car veeres right or left. If you drive and your car and your steering wheel shakes, its not an alignment you need, you need your tires balanced
Yes, wheel alignment machines do need to be calibrated.
No. If there had previously not been any alignment issues, and as long as the new tires are properly balanced, you will not need an alignment.
if you have independent suspention front and rear chances are a 4 wheel alignment can be done typically front wheel drive vehicles but not all.
A two wheel can be done, but a four wheel is preferred.
you need a front end alignment
You prolly need to replace brakes and rotors. Another possibility may be that you need an alignment as well.
You may need a wheel alignment, or you may need bushings.