My husband and I are driving cross country and will hit Yellowstone on the 5th of July. I'm kicking myself because a month ago I didn't book a campsite because there was so much availability. Now none of the campgrounds you can reserve have available sites. What are the chances we can get a campsite if we show up super early on the 5th? Do you think people will have shown up prior to the 4th and camp through the weekend? Just trying to figure out the best way to attempt this... Thanks in advance!