This is an old thread, so I may have answered this already. I live at 600 feet and hunt at 8000 in Colorado. I have found I need to triple my workout at home to equal the mountains. So at home I put on a 50# pack and hike the local ski hill for 3 hours to equal one hour in CO. This has served me pretty well. The local hill only has about 200' elevation, but it works. On a machine, an eliptical i set on full incline and full resistance for 1.5 hours to equal half hour pull in the morning up the mountain.
Hope this helps