ALL BFGs that I have run, from 235s to 295s, only have traction for the first summer.
after that they get into a harder compound, and they last for years. But they no longer have much for traction. So, to combat that lack of traction, I highly recommend to run as much rubber as the tubs will accept, which, on a Duster, is likely to be one of 235/60-14 or 235/50-15s on the front, and 275s on the back, unless you move the springs over, then 295s.