The towball in the top of the towing jaw has been used on Series Landrovers for sixty years. I have been using it myself for almost fifty years on various Landrovers, and have never had any problems, as long as you are reasonable with the load you put on it. I have however towed two tons without any problems.
As far as legality goes, it is worth pointing out that certified and labelled tow bars did not exist until some time about 1990, and as far as I am aware, there is no retrospectivity. However, all 50mm balls and couplings are required to be labelled. Not too sure what the deal is if you have a vintage trailer with inch sized  coupling (usually 1 7/8", 2" or 2 1/8" - one advantage of metrication was that 50mm replaced a number of sizes!).
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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