The rack
One thing I am disappointed about and maybe even leery of is the roof rack.
I had the tire mounted up there for a wheeling trip and with the way it was oriented on the rack, it bounced back and forth between the bars. The bars of the rack cross laterally and are about 4 inches wide, but very thin. When I tightened the tire, it pulled the bar it was mounted to up causing it to become uneven when compared to the rest of the bars.
This resulted in the tire repeatedly rocking back and forth essentially separating the bar from the rack itself. The cross bar hasn't completely separated from the rack, but definitely weakened. Anyways, I'm scratching my head trying to figure out a solution to the problem. I think I may remove the mount and redo it to where it spans across tow of the bars, or have my shop guy reinforce the rack somehow.
I don't think the rack is "designed" to mount a tire up there, but on any other rack I have seen this is often done anyways with no trouble that I have heard.