We use the same size tire for most of our 'Modern' Pro-street projects.
They are Mickey Thompson Sportman S/R.
Size: 31X18.00R20LT
Approved Rim widths: 15 / 16
Tire Height: 31.1 in
Tread Width: 15.7 in
Sidewall Width: 17.3 in
Heres a close up of another we did: