What is a Concept trucks/Surf-skate?

Concept trucks/Surf-skate - These trucks are usually designed with even deeper turns in mind, or faster return to the center, to allow you  to pump easier. These trucks are usually really fun at lower speeds, but will not be safe for higher speeds.

For example a Carver (c7) or a Gullwing sidewinder:

Information about Concept trucks/Surf-skate Information about Concept trucks/Surf-skate