Well, since you've been to Paragon, you know that within their trail ratings (green - easy, blue - moderate, black - hardcore) they also grade 1,2,3. It will be pretty simple to further set up a light moderate (blue 1,2) vs a heavy moderate (blue 3) run.
It certainly depends on how many show up - and what the interests are. Running skids, with proper tow points (a

requirement), a 3" lift (30/31" tires?) even with open diffs the blue trails are do-able. Of course, we also have an obligation to give everyone a reasonable time on the trail w/o the expectation that a particular rig has to be strapped alot. So, its always a balance between the capabilities and desires of the participants.
No reason why you couldn't challenge yourself some more than you have, you just have to be flexible depending upon the mix of rigs and drivers. And remember, everybody takes a strap every now and then, no shame in that. Also, the weather will affect things as well, add some rain into the mix and even the Green 3's can become a challenge.
I'd say that some form of traction aiding device is necessary for the Black trails, and some more height is highly recommended. As for the RED trails, generally the only requirement there is insanity!
And of course, for all trails, that one elusive requirement - driver skill!
Should be a good time again this year - hope to see you there.
Mike in NJ