You can park your RV next to a fishing bridge and if one person form the group is fishing, then you can stay overnight. Don't try it if one person isn't fishing all night. They love to issue the expensive tickets.
Make sure you have a current and valid fishing license since they do check for them. Trust me, I know. They even wanted a friend who wasn't fishing and standing there talking to me to show his fishing license. The friend spoke to him in Danish and the game warden walked away. If you touch a fishing pole, then they consider that fishing.