The Sao Paulo Motor Show in Brazil is always a good place to find interesting models that dont usually make their way to the U.S. Nissan is known for having a big presence in the event, and this years no different. The Japanese automaker brought the Frontier Sentinel Concept — we call it the Navarra here — to The Land of Drizzle. The Frontier Sentinel is a rescue concept truck is described as sturdy enough to go on missions in the most extreme and remote areas. In other words, it would make for a sweet ride in the U.S., provided Nissan makes it production-ready in the first place.