Mad or not, it seems a feat few, if any, could do today. No fancy or prepositioned gear, just what was on hand in his cabin at the time. How many would even try it now, let alone have the internal "stuff" to try. Maybe that's actually where the "mad trapper" part comes from. I saw -55 degrees in Alaska when stationed there. The idea of 48 days of no fire, nothing but raw meat to eat, and nothing but your own body heat to keep you warm seems almost unbelievable. Tough dude. Live those types today? Not me for sure.