I would put some sort of all terrain tyre - not sure of what is available in your 195/15 size.  I changed my rims to the Freelander 16" rims and am running BFG All Terrains which are a great all round tyre.
Also if you are new to offroading the Freelander you need to be careful if you go down into valleys - easy to get down but without low range and being a manual slow, steep hills can be problematic so just be a little careful.
As far as the towbar goes - I am not sure about the fitted plug - I just wired mine in the old fashioned way - spliced into the rear harnesses in the car - if I remember most cables are accessible under the car - right at the rear.
Good luck 
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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