Sounds like a fun trip, I hope you all have a great time!
I love taking disc golf road trips with the dog. Our first was a 3-day meet-up in Pittsburgh when she was about a year old. Since then we have traveled to 144 courses in 24 states, staying on the road up to 2-3 weeks.
A second human definitely makes it easier to travel with dog, especially during hot weather months. I can only imagine how much exercise a 1-yo lab needs.
You have probably thought of most of this, but here are some things I find useful:
Research dog-friendly places to stay if you may stop along your route. La Quinta is not fancy but dogs stay for free. Many other hotels accept dogs but charge an exorbitant fee.
Bring a well-used dog bed or blanket and favored dog toys. Dogs seem to appreciate familiar items when away from home.
Make a comfortable, safe place for your dog in the vehicle. I have a dog hammock in the back seat with dog blankets and chew toys.
Have an impenetrable barrier between your dog and any food, treats, and medications.
Cooler filled with lots of water for the dog and humans. Go-bag with dog food, bowls, blanket, chew toys, etc. for hotels on the road. Frisbees make good dog bowls in a pinch.
Take-out or drive-through restaurants are OK but if the weather is nice many casual restaurants have dog-friendly outdoor seating.
Good luck!