Advantages as others have listed, mainly together with oversize tyres. 
Offset wheels put more strain on both stub axles and bearings (which are reasonably over engineered in the vehicles you are talking about) and on the steering components, particularly the track rod.  Without power steering the steering can become much heavier, but I assume you have power steering.
The biggest downside is that in most states (not sure about Vic, but I think this applies there) they have become much stricter on this sort of modification in the last year or two, limiting it to very modest increases both in tyre size and track increase. It would be wise to check the legal situation before spending any money.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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