I've never car deadlifted, but @T3hPwnisher has.
The fingals finger is sort of like a handstand walk, but in reverse. You're going to need a strong core, and overhead endurance. It's sort of a crappy substitute, but I'd be working landmine presses a bunch, alternating hand placement each set.
Bring food, snacks, and gatorades or pedialite. For the truck pull, wear shoes with lots of traction. I hear rock climbing shoes work very well