If you are planning for an off-road driving, I will strongly recommend you to start with Nebulus Emergency Floatation Device. As the name suggests, it is an emergency off-road vehicle specialized with self-inflatable qualities. It is a life-protecting device during water or ice rescue operations under critical conditions.

Developed jointly by University of Minnesota and JTW Associates, the Flotation Device can be manually inflated by an emergency first responder or rider while breaking through the ice. The self-inflatable ability of the device brings temporary flotation for submerged snowmobiles and ATVs. It can support up to three riders simultaneously.
The Nebulus features a good number of pressurized carbon dioxide (CO2) bottles to inflate an enclosed lift bag. Thus, when the rip-cord is pulled, the Nebulus' inflated lift bag can lift nearly 1,000-pounds of the submerged vehicle and riders.
The Emergency Responders in US and Canada are now using the device as a safety tool during rescue efforts following the shocking report that marks death of nearly 50 people every year in drowning.
Via: Gizmag