I am fairly new to caravanning having only started in 1975 ! however always had 12n and 12s sockets in recent times however my latest van has 13 pins plug and tomorrow I am having the two sockets on the car changed to 13 pin, no problem there. the question is though how do I connect up is it push fit, twist or what and I have bought an alignment tool but do not know how to use it or why , please help a newbie with only 41 years experience. B)