non momentary switch

Hi, I would like to run 4 linear actuators at the same time but when I connect 2 or more to the switch they do not work but 1 works fine on its own. The linear actuators have 2 wires, they are 85W, 12vdc. The dpdt with off is a non momentary 12v 20A. The power supply is output DC 12v 25A max...