I have 27x10.5x15 qt pros on 15x8 wheels with 3 1/2 backspace and they fit fine. No rubbing at all. BTW the wheel lips have not been rolled ethier. Hope this helps.
they will work fine with 8 in rim wiyh 3.5 backspacing dont no about a 10 in rim it could be a problem . i have 28x 12.5 see my sig . i have no rubbing and my fenders are NOT rolled.
goodluck 8in is pleanty for the rear rims.