As big as you are comfortable with. We were on the South end and there were huge tour buses and coach sized RVs on the roads. This is a destination for people from all over the world and everyone's needs are catered to. Now, there are some skinny spots that might try your driving skills, but as long as your transmission is in good shape the hills and scenic turn-outs are all yours!
fantastic place~
Thanks! Your answer is awaiting moderation.