Tune makes two sets of skewers: the AC14, which they call "road" and the AC16+17, which they call "mtb". The difference is that the road set carries an aluminum alloy front rod. The other rods are all ti.
Since I'm not very fond of an alloy rod at front, I think I'll go for the full titanium mtb set. Is there a difference in rod length between road and mtb skewers? Would they be compatible with an AM Classic (Campy compatible) hubset?

No difference in rear length. On either set you have to cut off 5mm if you don't like the rear rod sticking out.