A boat trailer modified to include a dolly and dolly track, the dolly including a hook triggering mechanism, a bow cradle and a slidable hooking mechanism for engaging a watercraft bow ring at a wide range misalignment with the centerline of the trailer. The trailer further including a remote controlled power winch with an automatic shut off for stopping the power winch when a watercraft is fully loaded. The invention enabling a single user to launch a securely retrieve a watercraft to and from a watercraft trailer.