This is the classic sign that the truck was driven by a woman.
Invariably, whenever I see an SUV or pickup truck with these “accidental whitewalls”, it turns out to be a vehicle driven by a woman who consistently scraped the tire along the curb and–possibly–also hit the curb a number of times.
Personally, I would not buy the truck unless an inspection by your mechanic confirms that the front-end is still in decent condition. I have seen too many of these situations where a rim was bent and/or there was damage to ball joints and/or tie rods.