The tow truck weighs 5.89 kN. The wheel base (distance between the front wheel and the back wheel) is 7.41 m and the center of gravity of the truck is 3.66 m behind the front wheel. The load hangs from the tow truck 0.97 m behind the back wheel. How big can L be before the truck tips over? Give your answer in kN please. (Hint: the reaction from the ground on the front wheel goes to zero just as the tow truck tips.)