Gents, I have been to Hidden Falls numerous times, both with my old XJ, Bronco and more so with my X. I know the trails and can even guide if needed. I usually go out there with my friend with an XJ..
There are some good 1-2 for stockers and even some 3-4 that are a little under rated. But be careful because there are a lot of 3-4 that are over rated. I have a PML and 32" Duratracs that I do mostly 2-4.
The camping there is top notch and you can wheel up till midnight. Fire bans are non-existent and you are close to good water features for those hot days.
I have a good hook-up there that I can get good rates for groups and I have the map for the CustomMaps Application for Android.. it uses GMaps GPS to lay your location onto Hidden Falls Park map... Comes very handy and is a PITA to setup. It took me about an hour.
Clines is good but like it was stated takes 6 or 10 rigs for them to open the gates. Which is weak.. I would rather just drive the 30 minutes more to HFP..
Also there is one that I have not been to yet about the same distance as HF. Its called: Longs Ranch
http://www.longranchwheeling.com/
There is also trees Ranch
http://www.treesranch4x4.com/index.html