X5 E53 (1999 - 2006)
ive just bought E53 ( i think ) X5 2001 , 4.4ltr, and i want to tow a caravan, behind the removable panel on rear bumper there is a square plastic cap covering a socket which looks to take a removable tow ball, and also the is what looks like a trailer electrics socket, although its not a normal...