What fits -n- what
hits

I didn't get a pic, but the 37X13.50R20 Kumhos hit so bad that the power steering won't even turn it. If I jack the truck up 3" they do clear barely.

Longer Control Arms won't help here!

HotWheels D-Back (KMC)

OEM Rim 17x8 +43.18mm Offset
The rims are 20x8.5 with +25mm Offset. By looking, I can't believe another 3/4" (43.18mm "stock") would make the difference as in this thread
Stock-W/Big Meat!!!
there is only a 1/2" difference on the Backspace plus the rim is an 1/2" wider (1/4" on each side of center). Now I need some overtime and a Lift, the question is "how much"? Lifting it 3" with the jack is enough to turn, but that is minimum.

The overall width mounted is 12-3/8" (strapped 4 wide in back of truck is 49.5") and about 36.75" diameter
thought that would be the key

,
but it's the Offset/Backspace (SAE measurments - OEM 43.18mm = 1.7", 25mm = .984").
Somebody has to make OEM Backspace rims?

The good news is, they don't rub the Control Arms
Oh well, they didn't build Rome in a day
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'09 2500 SLT QC 4x4 6.7L RFE68, Bright White