I, on the other hand, love long road trips. I just finished a 4000 mile one 2 weeks ago, and I frequently drive from the Bay Area to L.A.
And that being said, I 100% agree with SByer. I rented a car for the 4000 mile trip, even though I currently drive a car completely capable of handling that milage - I didn't want to put that much milage on my daily driver.
Plus the dirty secret is the Tesla (and the Lotus upon which it was semi-based... and most sports cars) are not really terribly comfortable for long road trips. You could engineer a way to do it, but you probably would rather rent a comfort-mobile for the occasional long trip. It might be a bigger deal with the Model S. But for the Roadster, it is pretty much a non-issue.
Edit: typo