Does anyone know how the Plague Cart works "in game"?

I know threads were opened previously, but its been a while since postings were updated.

I'm running a mordheim league and started the carnival. Obviously, in game terms and in keeping with a story line, I gave my carnival a cart right away. (thought it would be proper for them to have it considering they travel around); but a interesting point came up when it was attacked the other night...

The cart was charged and we really didn't know how to work out damage. Does the cart go OOA if the "cart" is reduced to 0 wounds or do the horses and wheels have to be taken out as well? Also, are there 4 wheels when working out damage or just 1 wound for all wheels?

If all 4 wheels, the 2 horses and the cart need to be reduced to 0 wounds then thats 10 wound in total... and that seems to be alot. Someone help!