check out the
www.climbingskinsdirect.com skins for twins, I use them on my gladiators and the double tip loops work great. A buddy also uses them on his supercharger blowers. I might be a little concerned with the tourque on a 120+ ski with naxos or FR+. In the deep they would be fine but side hilling may suck. I have the FR+ and love them both for touring and resort skiing, with no problems with either ride height and durablity. The Insta-Tele problem that the regular freerides used to have has been solved with the FR+. Our crew tours on a combination of just about everything, from skinny skis to fat and trekkers to dukes, each setup has its own advantages and disadvantages. Your fitness level and determination are what will get you up the mountain, go with whatever you think you'll enjoy most coming down.