<p>Since the total weight you can carry is limited, I'd try to estimate your camera gear limit and then start from there. Take sme 5-6 kg of dead weight with you on one trip. Simply fill the space where you'd take the camera with something :-)</p>
<p>The you know how much you can comfortably carry. You have to count body, backs, lenses, tripod, light meter (if used), film. And the larger the body, the more weight adds up on the other things (except film rolls).</p>
<p>I do carry a basic RZ67 kit with me on family hikes (body, 110mm lens, back, sekonic 508, 3-4 rolls of film, no tripod). After about 2 hours I realy do feel the weight.</p>
<p>In your place I'd assemble an ETRSi kit. It is light, small, good image quality. OTOH you can get a Nikon F5 with a waist level finder (or some of the older Nikon F bodies with removable prism).</p>