I recently got back from a road trip up the northern California coast, and then over to Ashland, Or. I took a Canon P w/ 28 skopar, 50/1.8 canon, and 75 heliar; an XA; and a Minolta X700 w/ 28, 45, and 135 lenses. This ended up being too much. I really enjoyed using the 28 on the P, and the XA got a lot of use too. I used the X700 kit in Redwood NP. At the end of the day, however, I don't think my photos were that great. So, I still need to learn the lesson, often preached in these parts, that less is more, and keep it simple.
My wife and I will be hiking in the Sierras in the vicinity of Mammoth Mt. later this summer, and I'm thinking of taking only a single Canon RF (either a P or 7), and one fixed lens rf (either XA or Konica S2). The former would be for b&w, the latter color. Bring along the 28 and 35 skopar lenses (b/c they're so small), and a 50, but concentrate on using the 50 for landscapes.