I have a 12 pin flat plug on my Geist caravan. The white plug is equivalent to the row of large pins on the flat plug and the black plug is equivalent to the row of small pins. I made up an adaptor that goes to the white and black plugs on the D4 and ends in a 12 pin socket for the caravan plug.
The silly thing is that Geists came from Germany with the white and black European plugs which were cut off and replaced with a 12 pin flat plug for Australia.
For the D4 to recognise the trailer you only need a resistor in one of the indicator circuits, either a 21W globe or a dedicated resistor. No need for any other fancy stuff like the D3 needed.
				
			 
			
		 
			
				
			
				
			
			
				Bob
2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
2019 Discovery 5 SD6 SE, 20 inch wheels, 275/55R20 Nitto Grappler G2 tyres
			
			
		 
	
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