I run the Dual XGPS-150 with an iPad mini running MotionX for my nav solution. I don't worry about battery life in the truck, since I have charging options. Both work just fine while plugged into a dual USB cigarette lighter adapter.
This combo is awesome if you are running with a group or finding trails and exploring. The ability to lay down a track and mark waypoints, turns, and obstacles is awesome. I've got tons of time with MotionX now and have it pretty well figured out. The biggest problem most beginners have is not downloading the map set for the route in case you lose cell coverage and not knowing how to fully use the program. You can find online tutorials that show you how to declutter the maps and navigate along a route. All in all, it's one of the coolest toys for getting out into the woods and staying safe, while exploring places that you haven't been before.