Lifts a trucks body with spacers between the body and frame. Allows for bigger tires. Does not increase ground clearance.
36" to the bottom of the bumper
You need to buy a suspension lift kit or a body lift kit... a suspension kit is better and looks nicer
The short answer is you can. The question is should you. When you do a body lift it raises the body off the frame with longer bolts and tall bushings that are much weaker than a strong, short bolt...
Yes, they sell both types of lifts.