I've had 235/70/15s for the past couple years and had no issues at all on my 82 Dodge B150. I recently switched to 215/65/15s in the front and prefer the look, handling, and its way easier to steer since I have no power steering. For more detail info I was running the 235/70/15s on a 15x7 wheel with -6mm offset on stock suspension for the B150 (3300lbs axle)