well... there are many different causes for vibrations. The most common cause for steering wheel vibration at high speed is poor wheel alignment.
get a wheel alignment
when the sterring wheel is turned sharply to park, the engine shuts off
yes it will
The most common cause is tire out of balance or bent wheel.
Normally a bent wheel or tire out of balance.
check under the dash by the sterring wheel
move a sterring wheel gmc half ton
Bad tire or alignment is most common. It can also be caused by a warped brake rotor or drum.
The PS# does have an available aftermarket sterring wheel accessory.
One of the best steering wheel designs is the Logitech force feedback wheel
right behind the sterring wheel on the steering column