Citroen 6 Wheel SUV

Whoww 6 Wheels SUV Cooool!!! - Amazing videos are here
Here is a fairly odd looking SUV built by Citroen which has 6 wheels and is named the C-Crosser. According to one source, four of the wheels are powered by an engine and 2 of them by electric. I do not know fully why they chose that config yet, but I am sure someone will comment with the answer soon