I bought a pop-up camper in January at an RV show.
Since I bought it in a different state than the one I live in, they gave me a three day temporary tag... on Friday. Good for Friday, Saturday and Sunday.
So, when Monday rolls around... I don't have a valid license plate to drive on the road with the trailer.
Since I'm not going to go camping in January anyway... I park the thing.
Now, it is time to get ready and I go to the DMV to get license plates.
The kicker: You can't get license plates until you drive the trailer to the DMV office and let them verify the VIN. And no, you can not get temporary plates.
So, in order to legally drive on the road you need license plates, which you can't get until you drive the vehicle to the DMV.
The police were also very helpful when asked for advice: Don't get caught.