Well, if you passed on the armored van now consider the Quigley 4x4 prison transport van, complete with cage in back so that the driver is securely isolated from passengers. Looks like includes places for securing leg irons.
They say it would work for dog transport.
I say good for trips with passengers who might like to attack you with box cutters because they don't like your route choice.
Or anyone with kids.
http://cgi.ebay.com/ebaymotors/Ford-E-S ... 500wt_1182