Myself, the old military packboads suck....I've packed alot of elk out on them, and they still suck, especially when they break due to trying to pack a little more to save a trip. Don't know about any of the flea market ones either. I love my Cabela's Alaskan II frame. So far it's been dependable. Been looking to try a Kifaru Longhunter, as I've heard they are the best.
I'll take a mule over the best horse any day, (or any of my friends).The only problem with packing on a mule is it has to be convinced it is their own idea. The phrase "stubborn as a mule" fits. If they don't WANT to pack, they won't.
Gotta agree with kcebcj; that gun will fall out, probably when climbing up the bank coming out of a very fast moving creek....bye-bye nice rifle.