To climb Kilimanjaro last year I took a K-3 and 18-135 and it did pretty well, I think. I also brought a 50/1.8 and 15/4 but used the zoom the majority of the time. I also carried a mini tripod, the Ultrapod II. In addition I brought a 55-300 to take on safari after the climb but I didn't carry that one up the mountain.
My criteria was that it needed to be compact(ish), light(ish), sealed, and somewhat expendable while giving the best IQ I can get meeting those requirements. I already owned this stuff too so that was a factor.
If I didn't need to carry it all so far on foot I might have gone with my K-1 and a few lenses but this being what it was I needed to keep it lighter.
---------- Post added 04-09-18 at 12:30 PM ----------
Originally posted by Jock Elliott Mainly, I plan to shoot some nasty weather. No real expedition planned for me, but it seemed a good way to frame the question.
Cheers, Jock
Ah, given that I'd second the K-1 and 15-30 combo.
Or how about a 645Z and either the 25/4 or 28-45/4?