It would depend upon what direction you're coming from and where your reserved RV site is. There's some good info on this website that may answer your question.
RV Camping - Yosemite National Park (U.S. National Park Service)
I personally have never towed anything that big into the park and always try to stay outside in private CGs and take a small vehicle into the park proper.
2004.5 GMC SLT CCLB, Ride Rites, Turbo brake, EFI Live
2012 Arctic Fox 29 5T 5th Airborne, B&W, Prodigy
Papillon navigators Lily, Buddy and Willow