Elka shocks are the best shocks.
The shocks or if it has them, the struts, are worn out, and need to be replaced.
Replace the shocks, or struts if equipped.
Depends on what you're driving. Most cars have gas shocks and some have air shocks. Air shocks are more comfortable, with an automatic leveller, as in Lincoln Continental, in my opinion.
It's a truck. It is built on a truck frame. They don't ride like a car.
spring struts
Yes
Yes you can.
30 to 35 pounds of pressure is best for a smooth ride.
As recommended by the manufacturer, the 4 setting is best for a typical ride. You can adjust it to your liking, however.
Not necessarily. From what i understand, though, if you decide not to get shocks to accompany the longer springs, your ride quality will be a sloppy mess. If you have the extra cash, it would be best to get shocks that have more travel.
cushion your ride without them it would ride like a lumber wagon very rough
Air shocks allow the vehicle to ride smoother than regular shocks. Also, it helps the car carry greater weight over longer distances than regular shocks.