Found this while looking into aspects of the mining industry in Australia and thought it was an interesting vehicle to post.
Designed to operate in underground coal mines, it may not be ideally suited for exploring Demongrounds but it may be just right if those Demongrounds happen to be below the surface
More info can be found in this pdf although there's no data on speed, fuel capacity and so on (it should be noted that many purpose-built underground mining vehicles don't require high top speeds, they are often less than 90kph) http://www.industrea.com.au/IRM/Content ... r_page.pdf
It amazes me sometimes just how inventive people get when it comes to equipment/vehicles for underground work. Jeeps would have been a handy vehicle for tunnels due to their lightweight and small size so making a Jeep train seems a logical progression.