Dear Ansel -
Sinar F or P was one of those on my short list. You think about 16lbs? How do you transport the camera? Surely you aren't slinging the tripod over your shoulder with camera attached - unless you have the mightiest head I've ever heard of...
I am in the E. Weston camp with the motto "anything worth photographing can be seen from the road". For the most part anyway. I kinda figured if I was using the heavy non-folder I could just shlep everything over to the "photosite" (ha ha), set up, make exposure, shlep back to the truck and repeat for next image. That's pretty much what I do now with the 4x5, but that camera isblight enough I feel comfortable leaving it on the tripod and therefore slightly increasing my range. Also allows me to make a photo with only one trip to/from my vehicle.
Do you find you can make a picture with a single trip using the 810 monorail? How do you pack the camera? Surely it don't fit into any camera bag or backpack?