After rough setting the body on the frame I took some measurements to determine the proper backspacing for the wheels and tires.

There is 6.5" from the inside of the wheel well to the rotor flange.

There is 6.5" from the frame (shock lower support) to the rotor flange.

So looking at the FFR recommendation for 6" backspacing seems to be incorrect at there will be additional 0.5-1" of tire width that has to be added to the backspacing.

Currently I'm planning on running 20x10" 5.5" backspacing with a 0.5" spacer (if necessary), with a 295/25-20 this will result in a tire width of 11.6" and a tire height of 25.8"

11.6" on a 10" rim will result in 0.8" on either side of the rim.
5.5+0.8 = 6.3 - 0.5 (spacer) = 5.8"
This should give me 0.7" clearance to wheel well and frame

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