I've had my Bestop tub mounted carrier installed for a year now. It is still working great holding a 35" tire, and I still like it so far.
The hardware does suck though. A suggestion I found on this forum: Before installing, I took the whole bag with me to the hardware store, and replaced all I could with grade 8 stuff.
No luck on the "jacked up nuts". My kit came with two. One for the bottom left mount (newer TJ's only), and one for the third brake light bracket. Good thing there was two, because the first one stripped out and was unusable. Older TJ's that come with 5 spare tire bumpers instead of 3 will not have to worry about this.
Since I did not have another "jacked up nut" for the third brake light bracket, like the OP, I said fuggit. I don't want to mess with another one of those ever again. I used the stock wiring, and mounted a 2" led in my spare tire center cap.