Gitzo GT-2531 Mountaineer CF tripod

[phototrek]

I am looking at this tripod for my Canon lenes with the 5D2 and the 1D3. The lenes would be the the 70-200L f/2.8 and the 100-400L. Would this be fine to take on hikes? I am looking at only 3 sections for stability. Also, I am thinking of getting one of the Acratech ball heads. Can anyone recommmend which model to go with this tripod?