Fix wheel joint 2D under skateboard

Hi,
I need your help because i want to create a skateboard with an edge collider and two wheel joint 2D. My problem is the wheels, i didn't arrive to fix them in a position. In fact, i want to disable the suspension it is possible ? I have tried to set damping to 0 but the wheel move, they didn't stay on the trucks but they went hit my edge collider.