Some valid points have been stated ...
Whereas the ideal is to leave the pup with mom and siblings until at least 12 weeks of age, the reality is that many - if not most - breeders will try to get the pups "out" by the 8 weeks the
law states, not what the
YTCA states. I acquired mine at 8 weeks, no harm/no foul.
Travelling that much would be hard on the pup. I prefer travelling with mine in their car seat; prior to that, it was in their crate(s). But I never went that far with them, only an hour or so. To travel that far, the pup would need companionship - to be near/alongside you. It would make for great bonding time, but is not anywhere near the ultimate in safety ... like if you got in an accident!
The pup would also need frequent potty breaks. That was never a problem for me, as *I* need them, too
. The problem, as stated above, is that the pup will not have all her shots to be fully protected from the various things that can be caught - with Parvo being of primary concern. So, stopping at the rest stops to walk her where all the other traveling folk are walking their dogs is NOT a good idea. And stopping alongside the road for "virgin grass" is not safe for YOU.
I fully understand wanting to have your 4-footed baby at your 2-footed baby's graduation from Ranger School (quite an achievement!) - but if there's any way you can get the breeder to keep her while you make the trip, it would be so much better for her. I'm not saying it can't be done, I'm just saying perhaps it *shouldn't* be done.
In any event, good luck with your decision and Congratulations to your son.