I have a 2000 Disco II with 121k miles. Bought it used with one owner @ 56K miles. Yesterday we went for a beach camp and suddenly my wife notice the rear passenger side was all the way down when parked in the sand. I moved it to the pavement and it went back to normal. Could it be the spring or damper (as rave would say)? Only the rear passenger side though the rest are fine. Just making sure it's the shock before I change all of them. Thanks in advanced.