I do agree with your philosophy on heavy real world testing when practical.
I also carry a GMRS on the mountain trips (PNW), and a spare alkaline battery pack for the Wouxun besides the li pack it comes with, and many spare loose batteries that fit the two GPSs and GMRS also.
Radio and a flashlight got them close. Problem was I had dropped off a little shelf and wasn't visible.
Keep carrying a radio. It's a Good Thing(tm).
/johnny