... gradeability,laden/unladenDeg3/15 3/15AC Controller1,The innovative AC system offers quick response, accurate control, impact structure, excellent performance, ... accident when it is necessary Brake1, Maintenance-free braking system makes braking safe and comfortable.2, Motor brake for ... error.2, Easily removed back cover, makes maintenance easily. Electric Stand-drive tow tractor QDD45/QDD45E