Hi Geoff, it's remarkable that you should mention the Steyer, and me liking it. I recall in the mid fifties when that company pitted the Steyer, or the Haflinger as it was known in those days, against the icon of WWII, namely the jeep. On a specially prepared proving ground, they paired the two vehicles against each other, and it was ludicrous how the Haflinger had it all over the jeep. I can't quite recall the full details (what did I know at the time), but I suspect the haflinger had a two stroke engine, and was quite small and lithe in comparison with the jeep.
When I was in Graz, Austria back in 2005, I went to the Mercedes Dealer to have a poke around and I came across this vehicle (amongst others of course)
...although my favourite for proper off-roading would be this Unimog.
They come in all shapes and sizes, as well as configurations for probably dozens of tasks. Incidentally, in case no one knows, both the SLS AMG and the AMG G-Wagon are assembled at the Puch factory in Graz. It is the second largest city in Austria with a population of about 230K. - almost the same as fifty years ago. Regards Styria