Tellico is awesome - been there 3 times.
Tellico trails are either pretty easy that anyone and everyone can do or pretty damn hard that custom buggies can do easily OR you're not afraid to trash up your chit.
The last time we went up, finally got the chance to try the hard stuff. And...tried and tried we did but ended up winching up guardrail, & winched up helicopter pad. Went DOWN schoolbus - that was nasty as hell. Ended up plopping the jeep on its side. Trail 2 Rock Garden is pretty cool - just need some good spotting and a lot of time.
If you're going there with expectations of doing the hard stuff...Make sure you have a winch, front & rear lockers, and a rollcage!!!!!
The hardest trails are nasty and HIGH potential for some serious rolls, endo's, plops, etc. WEAR YOUR SEATBELT at all times!
Here's our latest trip last year:
http://www.lieblweb.com/Events/Tellico06/
Our trip from 2003
http://www.lieblweb.com/Events/Tellico03/
Terrain and the trails change all the time and what looks easy in the pictures from one year to the other - is totally different only in a matter of one season.