I thought I had seen it all. I was looking at Ebay this morning and came across an ad for a 2006 Goldwing. It comes with airbags that are installed on the gas tank in case of an accident. Take a look at the pics and it shows the airbags. It seems like it might hurt you more than it would save you. Looks like it may cause more neck and back trauma in an accident.
http://cgi.ebay.com/ebaymotors/Gl180...QQcmdZViewItem