Jack,
While I'm not a GM man, and am only interested in components, not 'the look', I do appreciate a good build. We live off Hwy. 20 east of Nevada City, about 60 miles due west of you. I sense a parallel pattern here with the choice of rigs over time, only I'm about 30 years older than you appear to be. Of the 14, 4WD's we've owned a few were:
1970 FJ-55/GM307/Hone O.D./Warn 8274/Power Loc/53 gallon gas tank/ConFer Toyota Jeep Trailer: Baja proven over and over again.
1982 Jeep Scrambler. Only the rear tub and part of the frame were original:NP435, 4.4L, I-6, ARB;s/4.88's, 37's, 4:1's, Dana 44/chromoly, Dana 60/Mosiers, welder, etc.
We finally settled on a hard side truck camper for 'touring', off-road, and long term travel, now that we can: incidentally coming down the other way at Mengel Pass. It looks a lot different than your trip over this same piece of real estate.
I like the way you have your choice of domiciles. Either for rough country or traveling. I was impressed by the almost complete lack of frame flex in the short vid you posted. My bro's '99 Ford F250 has a LOT if frame flex. Have you concerned yourself with a pivoting sub frame for between the truck frame and the camper? If you are going to go to a flatbed, it sounds like a good time to make that work.
Again, thanks for the ride: all 48 pages of it.
jefe