Camping in cold weather is pretty simple IF you have a cassette toilet. Black water dump stations become harder to find in the winter. We have a Northstar Igloo and have camped around zero with no issues. Water lines are all inside the camper envelope so freezing them is a non-issue and we use RV antifreeze in the cassette toilet. Biggest issue in cold weather is keeping the grey water tank and the exposed dump valve from freezing up. Antifreeze in the gray water tank helps to keep things "slushy" and a hair dryer on the dump valve thaws it out. A black tank might be more of a challenge but I would never keep the black tank empty as the solids will become a real issue very quickly.
And yes camping should be fun so having a properly prepared camper is key to having fun in cold weather.