Originally Posted by 
scrambler
				
			 
			It's exactly this approach that raises the legal issues.
If the person in front doesn't know the capacities of those behind (because they just happened to be travelling the same road) there's no liability because there is no duty of care.  Everyone is on their own and if the people behind get overconfident seeing someone get through a difficult section they are on their own with the damage they do to themeselves.  BUT if the leader knows they are inexperienced, and choses tracks based on that knowledge, and choses a track that results in damage to the people following and/or their vehicle, there may be negligence because there was a duty of care - he (or she) was LEADING them.
IMHO the better way of addressing this issue in this sort of context is to indicate that you are going to be in a certain place a a certain time and engaging in certain activities.  If other people chose to be in the same place at the same time, let them know that they are welcome to follow you, or not, a their own risk either way.
If there is going to be a "trip leader" there should be a club, insurance etc.