[Izzy]

there was a long drawn out discussion that if I remember right basically ended up with a majority opinion that ....
a pusher - non driven axel that may or may not lift that carries weight but that the actual connecting arms to the frame are behind the axel in question
a tag - non driven axel that may or may not lift that carries weight but that the actual connecting arms to the frame are in front of the axel in question .......