In anticipation and to fund my incoming road bike, I sold my "modern" dualie (2012 Lapierre pendbox based dualie) and am left only with my 1996 Dekerf Team SL and my 1989 brodie climbmax.
Here are my threads about them
https://forums.thepaceline.net/showthread.php?t=181686
https://forums.thepaceline.net/showthread.php?t=10250
I still ride my dekerf off road from time to time, and for the trails where I live it is fine and fun, if I was to go to moab again or get back into ultra long trail rides I'd likely get a new bike.
For the brodie, just got a new stem from Paul Brodie that raises the front end significantly. I doubt I'll be riding it off road any time soon, but thinking about making it into a gravel bike.