Lens/film/camera choice in this situation points the direction you might want to go.
If you are considering using only 120 film, remember that a 90 is approximately "normal" view on a 6x6/6x7/6x9. The Graphic View does not deal well with a 90 if you are not using a recessed lens board and, even with the recessed board, it is not ideal. (I've owned a GV)
A 135/150/180 is considered 'normal' on a 4x5. There are arguments amongst users as to which one is actually the 'best' normal but the GV will work fine with these focal lenses and about out to a 240mm and longer with a telephoto construction lens (It needs a bellows draw shorter than its focal length.) If you are going to use one of these lenses on a 6x6/7/9, they will be about portrait length. How would that fit into what you are wanting to do?
It would be easy to backpack with many exposures of 120 film. 5 rolls equals 50 exposures of 6x7 and 40 exposures of 6x9. However, a view camera is used quite differently than other cameras and I'm not sure that I would need more than 10 shots for an afternoon view camera work. Yes, it is possible to 'bracket' exposures with an abundance of 120 exposures but, to me, that kind of misses the point of the more deliberative approach of the view camera. One of the objectives is to get it right the first time. 10 exposures of 4x5 fits in 5 holders- not too bulky. 4x5 in color comes in 10 sheet boxes. Just enough to fill your holders. B&W comes in 25 sheet boxes so that is 24 exposures or 12 holders. Fill six holders with film before you go and shoot all morning. Use a changing bag and refill them at lunch. A common practice. Grafmatics hold six sheets at a time and would less bulky than holders.
In this situation, I would get a 135 or 150 lens and shoot 4x5. When I had my GV, my first lens was a 127 Ektar. Only a little bit of movement possible (The 127 was considered a "normal" lens on a 3.25x4.25 Speed Graphic) but the Ektar was sharp and does a good with close-up work. If you still wanted to have the roll back, it would be like having a second lens.
That's what I think. Doing the view camera dance is something very different from using an SLR. There is a procedure which must be followed that is just not there with a SLR camera. You speak of 'depth of field' A view camera with a modern lens which covers 4x5 well and is used properly can put the depth of field pretty much any where you want it to be. Same with most of the other perspective dimensions. I learned quickly with my GV and a 127 Ektar what I could do and I figured out the limitations of the 127 Ektar and worked around them and eventual got a 205/4.5 Velostigmat which was a dynamite lens at a low cost. And coverage to 5x7 so I could use what movements I had. Unless you want to do wide angle work, the GV will have all of the movements you need until you actually figure out how to use the camera. These days, when I go stomping out into the wilderness, I take a Crown Graphic with a 135 Caltar, a Tilt-all tripod, two Grafmatics, and some basic goodies- dark cloth, a couple of filters, meter, two cable releases. And my lunch.
It's fun to learn.
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