I have a Ranger 900XP and it is plenty safe on 6 inches of ice with tires and a full cab on it, weighing in at 1850lbs. If i have the tracks on it, it weighs right around 2000lbs and 8 inches of ice is good. 7 inches of ice alone will hold 2 tons, if you wait all the way till 12 inches of ice to go on, it can hold up to 8 tons. I will drive my full size truck on 10-12 inches no problem.