You might take a look at the Howes' blog:
http://www.travelin-tortuga.com/Travelin-Tortuga/index.htmlI am not sure that they are really full full-time, but close. They do some non-Tiger travel.
As to my personal experience: I travel solo, no pets. My longest Tiger trip to date was 7.5 weeks and I could easily have gone longer but my employer had other ideas.
Sometimes I try to imagine living in the Tiger. There is enough space in my regular cab CX for me and for my gear. The kitchen and the plumbing system and tanks are good sizes. My Tiger's bare-bones electrical system (no generator, no solar, charges from truck alternator when driving or from hookups which I usually avoid) might be a problem; I'd have to drive more to keep things charged up. Where would out-of-season gear go? And what about AC, which I don't have? It all works fine for my usual off-grid camping and travel in the Western states. Your travel/camp style may be different.
If you had a Tiger with an extended or crew cab, or if you wanted to have a back-bumper cargo box or tow a cargo trailer, or if you are a minimalist with no large toys, then maybe you could FT in one.
In terms of availability and flexibility, you might want to consider a more mass-production small C and tow and small vehicle for exploring.
Or maybe buy a used rental small C such as PhotoMike recently did. He put info about it on the TC forum.
2006 Tiger CX 4x4, 8.1 L gas V-8, Allison 6-speed