Not sure if it was specifically mentioned in earlier post but there is potable water at the Sugarlands dump station. Very tight turns through the dump station road but manageable if taken slow. I'm not so sure I would enter Little River road at Townsend and drive to Elkmont with that size trailer. It's doable but pretty tight in spots. I always go through Knoxville and come down through Gatlinburg bypass. There may be a better way traffic wise but much easier to negotiate. When not towing I much prefer the route you described.