I'm planning a trip from NYC to Phoenix. I was wondering if anyone had any insight on motel stays. Should I make reservations in advance or just wing it and stay at places that we find on the way?

I'm worried that things might go off schedule and I won't be able to keep any reservations I might make. Then again, I don't want to be left without a place to stay.

Any input/suggestions would be greatly appreciated.

Thanks!!