I ride with my rifle in my Kifaru sling on the nastiest, single-track trails Idaho has to offer. I'd rather ride technical trails without a rifle at all,...but the Kifaru isn't too much of a concession when hunting. A rifle strapped to a bike is soon to be damaged in my experience. Our first instinct when crashing (inevitable at some point on a bike) is to protect ourselves...which I why I want the rifle attached to me.
For all of you considering a TW200...I'd respectfully suggest looking at a CRF230 or the newer CRF250F as an alternative. They are MUCH more capable trail bikes, and much lighter than the piggy TWs. Seat height difference is negligible as well, which is what most of you are drawn to with the TW.
Dave
TWs are great for riding down unimproved, two-track roads if that's what you're looking for. If you want to ride designated single-track USFS trails though, it's not even close...the CRF is a MUCH better choice.