There is not much 4x4'in out there in Midland, but I say go tackle Monohans with all you have!!! I havent been out that way in a couple of years but Fort Davis used to be my playground every summer for about 10 years. Have some fun with your new FJ!
On that thin sand out there I would stay on some low dunes first and just make sure you keep your momentum up until you get comfortable within the FJ. You will be surprised at how well she handles off road and it won't take long until you feel real comfortable in her.
-Aggie
Yeah, I'm planning on hitting Monohans. My Dad went out there a lot with his old CJ. He found an oasis there that the family used to go hang out at on the weekends. I figured it would be fun to see if I can find one. It's going to be wind this weekend so I won't be going until next weekend at the earliest.