Land Rover Repair: Steering vibration, steering damper, road hole

Question
Hi! What's the most common cause of steering vibration? Is it the steering damper? What do you recommend to replace after 100 milles?
Thanks a lot for information!

Answer
The vibration is constantly had at any speed, than it can  be by wheels aren't well balanced, or in the wheel there are some mud, or anything like that had sticked. (try to balance the wheels, and/or wash them with steam cleaner)
If the damper is wrong, you can realize: after some road hole the steering wheel starts twitch, and very hard to hold it, unless you slow down a little.

100000 miles? O.K. but what type of LR?