Definitlely put it across the back seat, especially in a tristar. Putting it towards the front with none in the back will make your nose dip very easy. If it is a open bow, try putting industrial trash bags in the front under the seats, then filling them with water and tying them off. Ghetto but effective. Large ice chests full of ice and beer work well also, especially in college. The wake tends to get smaller by the end of the day though.