The guy (company) that designed the frame, suspension, wheels for the rover owns a company that builds, among other things, mountain bikes. Litespeed is a high end titanium bike building company. They turned to aerospace when the bike industry crashed in 2007. Their bike sales have fallen off sharply since that time. This is the same company that designed Lance Armstrong's first Tour de France victory TT bike. It was made of titanium. (Had a Trek sticker on it...)
At any rate, I would love to see a US company build a titanium dual sport motorcycle. Not sure if its been done before. But, given they have built MTB's and Mars rovers out of titanium, I would imagine they could do it for motorcycles. Super strong, super light...