Sway bars on an offroad vehicle are always a compromise between on road and offroad performance - many coil spring utility Landrovers have none.
Larger sway bars can be fitted, although I do not know what the availability of them off the shelf is. 
The drawback will be loss of effective articulation; whether this matters depends on what you are using it for. 
Before making any decisions, make sure that the problem is not tyre pressure.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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