I can only think of a few guys that drive their 7s on long trips. It's not really the reliability... though you'd be silly not to carry some tools with you. It's the creature comforts that most people want from a car on long trips. Like staying dry, relatively quiet/buffeting, conversation...
These cars are built for lightness/performance. Which means little insulation, you can hear the mechanics of the motor, suspension, tires (squeaks, vibrations etc...).
I think these cars may be a bit too hardcore for you... I bet the honda goldwing is a more comfortable set up for touring than a 7. That would be my goal... to try and be comparable to that going down the freeway.
Don't get me wrong, there are those that have made their cars trip worthy and enjoy it... just check out that other post where they're talking about a 2 week trip in July.