Well if its in Montana their cows probably aren't up by the fence very often if at all to break it. Our cows and bulls would love it as a new scratching post and would all stand there and watch as I drove over it and fell through cause they broke it and I didn't notice. Also that fourwheeler does not look to be the biggest fourwheeler either probably a 450 or 500 not a 650 or 700. Little weight difference there also. If it works for them, good for them. I'll just stick with a gate keeps me from getting completely lazy by having to get off the four wheeler every now and then.