FOr LTB info I strongly recommend Paul Bawer's book: The Rio Grande Guide Book at nrs.com
There are lots of fun sections of just about every class, the sections above the LTB are difficult to access (long steep hikes and/or remote roads where it's not recommended to leave a vehicle)
Typically it's run in a day with lots of developed camping near the takeout (Orilla Verde): Orilla Verde
You could load up your raft, but it's easier to car camp and not have to run a loaded raft down the box.
The Chama has permit and day sections below El Vado, which are dam released - typically flows on weekends for recreation. There's also a short season section above El Vado that's rarely run due to takeout difficulties (Lake paddle or steep hike). All Chama sections are class II to III-.