Thanks for the reply Rick... I'll do my best to answer your questions...

Camera: Canon 5D Mark II with vertical grip attached
Lenses: EF 24-70mm f/2.8 (attached to the body) and EF 70-200mm f/4.0 (needs to be accessible on the fly) other lenses will vary and can be carried in my pack and will be used in pre-planned scenarios
Support: I carry a tripod strapped to my pack and my trekking poles can act as a monopod on the fly
Conditions: vary greatly, I go everywhere from desert to freezing snow capped mountains, to muggy rain forest (and sometimes if I'm lucky a nice sunny, peaceful day by the lake )
Other gear: I carry a NorthFace Terra 45 usually, and shoot for between 25-35 lbs for a week trip depending on what conditions dictate

In the past I have left my SLR/DSLRs at home too because of the weight and bulk, but as I am pursuing a career (at least I'd like to hope) in photography, I can't just take a point and shoot. Although I do generally keep one in a pants pocket for general scrapbook type shots.

Hope this helps!