Tire size 2dr 2wd Tahoe/Yukon

[altereddezignz]

Ok guys i am looking for the correct tire size or the max tire size to run when bagging a 2dr 2wd Tahoe/Yukon. I want to be able to lay frame not looking at laying rocker on a 20" wheel. YET!!!!!!

[AT Work]

245 and 255/35 are the common sizes used with the correct backspacing. I'm not sure what the backspacing is though.