I would go with a 60 series tire because it is fatter than the 65 series OEM. A 70 series tire is more narrow than the 65 series. I plan on taking my 4 Runner on the beach where a fatter tire would be better. The 70 series tire may be better in snow because it will have less rolling resistance. I wouldn't recommend going too far from OEM as it can effect ABS, and cause speedometer and odometer error. You wouldn't want your warranty expiring too fast.