I often carry my track tires in my NSX. They are the stock '91-93 sizes.
I single bag them, no towels, and they don't damage anything.
However, if there were a track that were 60 miles away, I would consider driving there on the track tires (I don't use Hoosiers though).
I don't know much about the Ecsta V700 because this is a newly-introduced tire.
I just spent three days at RA over the weekend. There were five NSX's at the event (two instructors, two students, and a guest).
[This message has been edited by nsxtasy (edited 06 May 2002).]