It's 2,000 miles there, 2,000 miles back. I can fairly easily drive 600-700 miles a day, so it would be a kinda crazy road trip , yah, but it wouldn't be the first crazy one like that I've taken & it can be done.
The other possibility would be to fly out (flights to there are less expensive in August, I imagine, because like Geevee says, it's kinda melty hot then?)
If I can fly out I'd rent a car, and if I flew out & rented a car, I'd have time to get the docs AND drive the Hoover Dam escape route.
PS. I don't think the docs are free-free; I think they charge for the cost of making copies.