Best route for Custer State Park to Fishing Bridge

If you are not super familiar with mountain driving, one route that I would avoid would be to take 14A from Burgess Junction, Wyoming to Lovell, Wyoming. This is a route for very experienced RV drivers or truck/trailer driver only. The road is super steep and crooked. It would be dangerous unless your rig is equipped with a selective tranny, excellent trailer brakes, and nerves of steel. DO NOT TAKE THIS ROUTE WITHOUT MILES AND MILES OF MOUNTAIN DRIVING EXPERIENCE.