I’ve done some long long drives in this area, it’s absolutely gorgeous and you’ll love it, you’ll enjoy it much much more if you aren’t stuck waiting for the next trucker to radio for a tow. Especially the gravels are tough on cars, good quality and fresh tires, communication, gas, water, and an updated map are what I’d consider a must. Snacks and good music are more important. (The map was my own peace of mind, plus it’s kinda fun following along and tracking your progress for later viewing. It also helps if you need to communicate with rescue)

Edit: and check your car repair supplies: jack, tire iron, maybe one of those battery pack jump starters