As far as wheel size goes, you want the width of the rim to be no less than 4 inches smaller than the width of the tire.

There is the exception of some tires like boggers and such that you can get in 19.5 inch widths.

15x8's would work great for an 11.50 tire.

Gun it and run it!
1981 CJ5,258,T-176,D300,AMC 20,Dana 30,Trxus M/T 31x10.50, Rancho 5000's, GroundPounderFab front bumper, polyethylene gas tank, aluminum dash, AutoMeter gauges

What this country needs is unemployed politicians.