Thanks for the advice.
I am treating the Premium just like I treated HP5, thanks to Steve's and Frank's comments.
I am just about to fall asleep in Estes Park, CO after my second day on the road. 1,250 miles so far. Turns out that we lucked out and took the trip on a fee-free weekend for all U.S. National Parks! Once we found this out at Zion, we made a major change of plan and decided to hit as many as possible. We have been to Zion, Bryce Canyon, Capitol Reef, Arches, and Rocky Mountain National Parks...not to mention everything in between, which, IMO, is better than the parks. (We had planned to stay the night in Salt Lake with a friend, but canceled and camped between Bryce Canyon and Capitol Reef.) I have to say that Capitol Reef was my favorite of the five, and a thousand times better than that was the area between Escalante and Boulder, UT. It is without doubt the most amazing landscape I have ever seen...and I don't even remember what it was called due to information overload in the past two days (and 34 hours of driving and only 4 hours of off-and-on cold, hard, wet camping sleep, between the two days).
Turns out that I am shooting a crapload of color medium format on this trip so far, and very little b/w 35mm. However, now that we will be entering the flats, I will probably not be as tempted to pull out the RZ (which has spent the whole trip since Zion mounted on the 3051 'pod in the back of the car, with the 65, 110, and 210 APO lenses sharing duty fairly equally so far) or the M645 (which I have been using hand held with Fuji 800Z and the 55mm lens).
Casualties so far: one M645. It tumbled out of the car onto the pavement when getting into the motel tonight. Luckily, just a scrape on the left hand grip, and all still works well. I had let it on top of some stuff in the back seat and forgotten about it.
Thanks again. Off to bed. Sleeeeeeeep......