RV power cords such as the black ones pictured come with one end stripped to be hard-wired into your RV and one end with male right-angle molded plug.
The 30 amp cord is a type 10/3 STW cord. The 50 amp is a type 6/3-8/1 STW cord.
The 'plug in' power cords pictured in yellow above feature a Marinco twist lock marine grade waterproof molded plug. They have super flexible cords (30 amp is 10/3 cord and 50 amp is 6/4) and an LED indicator light to tell when power is at the plug.