I'm in the same boat as you, I started with the RC long arm and I went with the UCF brackets and JJ's. No complains thus far, just keep in mind the shanks on the JJ's are a lot shorter than the RC ones. Double check your measurements before burning in the brackets.
If I could go back and do it all again I for sure would have started with a Clayton long arm. I may need to beg Matt for a deal on the front two brackets, I'm nearly positive I am not going to have enough thread engagement on the joints to run them comfortably. This is admittedly my fault as I followed the directions for where to weld them on the frame instead of doing my own measurement and mock up.
Looking for: 03-06 interior plastic trim. PM me.