There is a lot to read on this if you search on this and other rv forums.
First check the laws of your home or domicile state. Most have some pretty strict rules about residents and vehicles. Here in Illinois, it is 30 days. If you live here, or move here, you have 30 days to get an Illinois drivers license and register your vehicles in Illinois.
And yes, they are cracking down.
I thought I was being very careful,but when my Montana LLC bought a DP from a dealer in Florida and took it home to Illinois, it took them maybe 14 months to come after me. $7.75 percent of a buncha money plus a $1300 penalty later, my bus wears Illinois plates.