Last time I did the inca trail, I only had a canon G2. This time, I'm going with a 5d mk iii, a 50 1.4 and a 24-105L. MIGHT take the 17-40 with too. ANY need for the 70-200? BIF?
I have 64GB of cards with me and two batteries, hopefully, that will do. I mean there IS power in AC
I doubt you'll need the 70-200. At the altitude of Machu Picchu it's often cloudy, so telephoto use would be limited. I think you'll want the wide-angle end of the spectrum much more frequently. I took my 60D with just my 15-85 IS (equivalent to 24-136 on FF), and there was not a single shot I wanted to take but couldn't. I suspect Inca ruins, panoramas, and perhaps your fellow hikers will be what you'll want to shoot, and your 24-105L plus 17-40 should cover that admirably.