CT,
I haven't been on the trail to Monache Meadows and I'm not real experienced with the FWC offroad, still getting a feel for it in the seat of my pants. My experience is more like yours with the smaller, lower CG rigs (jeeps/early broncos/etc.) Even this short/light camper feels big to me and I've had to learn to watch for limbs up as well what the trail looks like.
That said, looking at the pics and write-up of the trail you're thinking about I wouldn't even hesitate to give it a shot, but I'd be willing to turn around if it didn't look right to me too.
I hope Les and Patrick won't mind but I ran across these posts from lqhikers and pvstoy and thought I'd pass them along:
"our eagle shell on 4x4 tacoma was broken loose on one of our trips to baja when we were following the baja race course down not a normal trip . we did some extreme 4 wheeling ,and yes we were air born a few times. on this same trip we broke the truck frame at the air bag mounting point.so that is why i have used factory mounted turnbuckles plus added mounts at 4 corners, i know if i had slowed down and enjoyed the drive it would not of happened! "its the journey" "
Les also details the added tie-downs on this thread:
http://www.wanderthewest.com/forum/showthread.php?t=753
and notes they haven't had a problem since the upgrade.
Here's another (taken out of context) quote from pvstoy: "...I have been on "very" bad roads, many of them. I have watched the furniture re-arrange positions in the camper. I have put screws back into the cabinets that have worked loose. It has been off road on trails that the truck has been beat up and fixed. I find the FCW is very strong and I see no damage..." This was in reference to through bolting the camper to the truck...see the thread at:
http://www.wanderthewest.com/forum/showthread.php?t=1270&page=2
I'd guess Les and Patrick have used the FWC's harder than most and should have a good feel for what they can do off road.
To answer your question about how much the camper can take, the camper may take more than the truck or stock mounting system, judging from Les and Patrick's experiences.
Happy Trails
'birds
P.S. Most of the experienced off road folks recommend removing the jacks (if you have them) unless you're actually getting ready to take the camper off...helps keep from bending the frame when the jack hits a rock/curb etc.