Even remote roads in central Europe are mostly tarmac these days and modern sat navs know the most obscure dirt tracks. So is driving at the edge in challenging terrain still possible? Enter the Inios Grenadier, a re-engineered Land Rover Defender and cool piece of utilitarian chic that is not just another jacked-up sofa. A remote part of Romania is just the place to put this boxy daredevil machine through its paces. Several hundred drivers a year looking for adventure have been happy to fork out €3,000 per vehicle to romp their way for a week around these Carpathian Mountain forests. The even…