There are plenty if wireless video transmitters available in eBay That you can hook up to in car infotainment screen (search for "rear view video transmitter"). Haven't tried one but they seem pretty cheap. The other option could be a 12v wifi security camera. I have used one of these before and they have a built in wifi server which you can connect to using a smartphone or tablet. These are more expensive though.
				
			 
			
		 
			
				
			
			
				Oztourer
MY05 TDV6 HSE, Buckingham Blue
Front Runner Slimline II roofrack and rear ladder, Safari Snorkle, Mitch Hitch, Traxide D3-DU, Bushman Fridge, Icom IC-440N UHF, Hema HN7, Tyredog TPMS, GVIF and reversing camera
			
			
		 
	
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