20" Wheels & Backspacing Question - PLZ HELP

[forcedinduction]

I've searched and read a bazillion threads for hours and can't seem to get a definitive answer!! Hopefully this can evolve into a good reference thread. I know there are other similar threads, but I didn't see any of them with the exact info I need.

I know a bunch of you are running 20" rims and I need to know the backspacing and spacer thicknesses before I pull the trigger on some new rollers.

Please post up pics and info including :

1. Wheel sizes (front and rear)
2. Tire sizes
3. Brands of both
4. Backspacing
5. Spacers used
6. Fitment (Do they or did they rub?)
7. Suspension mods & parts manufacturers
8. What would you change if you had to do it again?

So PLEASE, help me (and others) out and show off that rolling stock! A huge THANKS to everyone that takes the time to help out!!!