I took my explorer there for the first time the Saturday of the Dec 2004 Monthly ride. There were only 4 groups from stock to tube buggies. I was in the second group, along with a stock H2, stock S10, stock late model Range Rover, modified BII, and a couple of Wranglers, including two Rubis, etc. At first I thought we wouldn't do anything that hard at all - I was expecting mostly dirt roads all day. Man, was I wrong - and very pleasantly surprised. I really don't think we even did anything more than mostly greens and a few blues like Wumpum Hill and the rockswamp, but I was impressed with what they consider "green" and "blue" trails. They were definitely more difficult than I expected.
I don't buy that having a rear locker essentially equals 4wd and here is why. At one point, we were going up a slight, loose rock / gravel hill and I had forgotten to hit the "brown wire mod" switch to put me back into 4wd - even with my SSRs and No-Slip, all I did was sit, spin and fishtail. Flipped the switch to 4wd, and crawled right up. Now, I know I have a rear locker, but the stock Wranglers - not Rubis - made it with open diffs and street tires. Again, I couldn't make it with 285/75R16 SSRs and a No-Slip and they made it fine with 4wd, open diffs and street tires. IMHO, a rear locker does NOT equal 4wd.
I know it probably sucks to hear this, and again, I'm not sure about the rules, but I wouldn't bother going to Paragon with only 2WD. It may be against the rules - someone should really find that out - but it would definitely be incosiderate to the rest of your group if you keep getting stuck on every other trail and people have to keep waiting for you to be strapped or winched out. If this is your first time, ride shotgun to get an idea for the trails...then you'll be able to make a better decision for next time.
Have fun - wish I could join you.
