Not unless they are all worn out. You can replace just two tires. I recommend you replace both front or both rear tires at the same time. Also make sure that all 4 tires are the exact same size. If the tires are fairly new and not worn you can replace just one tire if one was damaged as long as the size is the same.
A tire store will replace any or all of the tires that you want. It depends on how many you want to purchase. They will not try to pressure you into anything you don't need.
Most newer Tacoma have a belt tensioner and it should be tight all the time, if its not you may need to replace the tensioner.
Yes you can, as long as you replace all four tires. Having different sizes tires on the vehicle will ruin the diff as the car believes it is constantly cornering, thus wearing either side at a different rate.
Fragmented question?? If you have under 3/32nd's remaining on your tires replace them. If you have wires hanging out of your tires replace them. Replace tires as needed or rather replace all at once if you do not like mis-matched tires. However many people will replace just two tires at a time then rotate when the other two need replacement.
I would head down to your local tire dealer, who can take measurements of all your tires and give you the required feedback on which, if any, tires you need to replace.
No, you can replace one tire as long as it is the exact same size as the rest of them.
Yes only if you change all 4 tires !
It depends on how old your tires are and how warn they are. The front tires will wear out first, so if they replace your tires regularly then you can get away with only replacing the front two. If you rotate your tires when you change your oil or don't replace your tires often enough then you will probably want to replace all four at the same time.
You should replace your vehicles tires approximately every 60,000 miles. Or when the tread on the tire is close to all gone.
All weather tires or all-terrain tires is great choice of tires for your vehicle if you reside in Arizona and in similar states.
If it is all-wheel drive, then yes! HA! Drive tires must all be the same tread depth. Flatten one, replace 4. Oh, the downers of all-wheel drive!
Alignment