That is an awesome set-up, DominicG, with the awning and the roof top tent.
I have the small ARB Touring awning, which appears to be identical to the Camping Labs stuff (except they don't have the smaller one available, and they have a better price

), and I love having it in the desert.
I've been considering their roof top tent, but I was concerned about being able to pack up and go quickly. I was also concerned about the extra 120 lbs sitting up on the roof, considering I usually bring at least two 10g fuel cans and two 10g water cans up there (about 150lbs or so in liquids). In addition, the tent would sit higher because I have a Gobi Ranger rack, rather than the ARB Touring rack set up for the tent.
Let me know how your FJC handles, trail-wise and clearance-wise, with the tent up top...