1.) Get a wrecker coming to the scene early, especially if it is in the crevasse rock on river left. Yard the whole wreck up first, then access & treat the occupants.
2.) Anchor any auto in swift water to dry ground on either side of the river to keep it stable and from being swept further downstream by punching windows above the water level and passing through the A, B, or C post.
3.) Minimize rescuer exposure by having one equipped with helmet, pfd, & harness tied to a cross river rope angled 45 to 60 degrees across river.