Driving distance is fine. Just remember to rest for about 10min every couple of hours in a well lit rest stop. There are plenty in the US! Well, at least what we saw when we drove from Calgary to Seattle.

It's also a great way to see your country! If you have the time, why not?

We're driving to Sydney & back at christmas...It's around 4000km but it's worth it! We've driven part of the way before so we're aware of the distances between roadhouses(that's pretty much it in some areas), the heat & the time.

Good luck!

C