As others have said, the 5x7 and a TLR would be my choice. But since you already have the RB, I'd take it.
For windy/rainy days, it's always nice to have the more rigid option of the MF.
And the FM is light enough to stash regardless of what else you're carrying. If you have an 85mm or so lens, I'd go with that. A wide angle can be nice, but out there, it will never be wide enough. The place is just amazing.
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