Here in the States. Off road trophy trucks all have the radiator and fan in rear. these trucks put out in excess of 700 Brake horsepower and sit for extended periods of time with no overheating problems. Drill a few holes behind license plate to aid in cooling and add some ducting to get more air in area at speed.Like the side ducts that are popular in the German Look crowd.
http://image.off-roadweb.com/f/84993...Suspension.jpg