I want to upgrade the warthog because it's not that realistic. The gunner is too vulnerable. so I propose a more armored vehicle with 6 wheels. I call it, the ECHIDNA.
It looks like something to the effect of this: http://www.google.com/imgres?hl=en&safe=off&tbo=d&biw=1366&bih=667&tbm=isch&tbnid=DJwci8hi-YYg8M:&imgrefurl=http://www.ipmsstockholm.org/magazine/2008/03/tamiya-m20.htm&docid=Vuy4FbM8B6FbZM&imgurl=http://www.ipmsstockholm.org/magazine/2008/03/images/m20_1.jpg&w=640&h=480&ei=YOv9UOD2Iejw0QG0zoDQCw&zoom=1&iact=hc&vpx=856&vpy=127&dur=3307&hovh=194&hovw=259&tx=197&ty=158&sig=106868165913162362213&page=1&tbnh=140&tbnw=192&start=0&ndsp=24&ved=1t:429,r:4,s:0,i:94