It is all about the weather. We actually go north during the December/January timeframe and boondock as we go to Buffalo Bills games. Last year we stayed for a week in the Orchard Park area and got a foot of snow and some howling winds, but as we were living in the RV everything stayed warm enough. (It also gave me a way to find every access point for freezing air to enter the RV and fix that!) Yes, you will run out of propane if you do this long enough (we were close to a Camping World to go refill) and if you don't have tank heaters or enclosed tanks, your tank contents may freeze (along with the pumps) so just be prepared.
In your case, a one day drive down to PA/MD shouldn't be too hard on you, but you never know about the weather. Be prepared to ride out a storm in a rest area or WalMart. After MD/VA you should be in good shape heading south along the I-95 corridor.
I'm not sure about your Hurricane, but ours has the water pump inside under the bed next to the fresh water tank. It should be safe from freezing as long as you keep the inside temps up and run the water occasionally.