What Sambo said - The staff at the Spirit are pretty good with putting vehicles on the right deck, but when you go through the booth just mention how low your car is to make sure.
A good rule for back roads in Tassie - assume that every corner gets tighter as you go around. Many do.
If the weather is good the West Coast has the best roads around. But, some spots over there rain 300 days a year!i lived there for 2 years and grew webbing between my toes