I trust Warn as an American Company
Rear diff guard is a maybe, not digging the weld on option
Have the tire plug kit as I don't travel with a spare (gasp)
I use the stock jack no problems with it on gravel, dirt, or pavement no need to carry a heavy *** farm jack or stupid exhaust jack
I don't really understand a Diff Drop or feel like I need one, I have maybe 1" lift in the front so those angles aren't too extreme. I like stock...stock=reliable
and tom4bren no heavy front end loads so I don't know about HD torsion bars isn't the front end stiff enough? Do you have them installed?