Welcome from Wisconsin and congrats on your new camper. Supplied needed include fresh water hose, good quality sewer hose, water pressure regulator, black tank treatment, 30 AMP extension cord, disposable gloves, extra fuses, wheel chocks, couple PT 2X6's to level camper side to side, level, and at some point you might want to consider a surge protector from Progressive Industries. If your camper doesn't have an on board water filter get a blue torpedo water filter from WalMart. A roof top vent cover will let you keep the vent open in the rain. Others will chime in to add to the list. Another thing needed is a sense of humor.