We are hitting 2-3 parks in the next couple of weeks and they're all typically 6-12 months notice to be able to get a spot in the parks. But my wife is on a couple of RVing boards and she said that a lot of people there are cancelling their longer trips and staying close to home. So I took a shot at a couple of parks and had no problem booking for the next couple of weeks.
We are hitting Grand Canyon, Redwoods National Park, a church owned camp, and Yellowstone (might have to cancel that if we get behind schedule).
Looking forward to a couple weeks on the road.