Icelandic super jeeps are quite unique as far as off road vehicles go. While based on a standard 4X4 they are heavily modified to be able to handle a larger range of terrain types! You will deffinately know a superjeep when you see it thanks to its HUGE tires!
The country gets its fair share of snow and ice during the winter, but it also has glaciers all year round, which means a lot of adventure up on the ice with huge 4x4 trucks. There are many tour operators with a wide variety of vehicles available.