Update. Did the drive. Beautiful. Gliding on perfect roads all the way up and back. The only problems were getting out of and back into Brasilia, though even that was not horrible. I would say Brasilia with all its concrete butterfly interchanges and overpasses is like an LA without exit signs. So it makes it a bit confusing because I can't remember the last time I drove in a city where not every exit was clearly marked. And I didn't have GPS but it wouldn't have mattered much. I got lost coming back into Brasilia so I just stopped at a gas station and some random lady who spoke English made me follow her until I got on the road to the airport and once I was on it the exits were perfectly marked.