Aw man, i was just up there, came back down today. Yeah, I fit an extra 285/70/17 on the stock spare, it has enough wiggle to just fit. Might get another full rim to just avoid having to shuffle a flat in an emergency though. Getting a 5th wheel on the spare was mostly a test to see if it...
I did it on a lift and don't really recall any major difficulty. Disconnecting front sway bar endlinks helps a ton with articulation. Good luck and enjoy!
Which bolt are you finding difficult to feed through the UCA? That super long bolt? Its been a while but it took a little finesse to get it all lined up but it was plenty long enough once I got it started on my install.
Mike