[James Ball]

A word of warning: in the event of a crash (I know, it will never happen to me...) those four wheels will kill you. No two ways about it. Personally, if I was driving any distance I wouldn't want anything that big and heavy unsecured behind me. Even an unsecured child sitting behind your seat will probably kill you in any crash above low speeds (i.e. 30 mph)

Sounds a bit dramatic bit its true.