As previously stated, you need to follow up with the sheriif. They just want to know the duration of stay, people in the group, and vehicle information. I'm winter camping during the warm spell here in MN, and it's pretty quiet. The area is muddy with the thaw, but that's to be expected. There's quite a number of spots that all have fire rings. A large 5th wheel might have a struggle with some of the spots depending on availability, but anything else should be fine.