I bought one of those hose bridges to provide the proper slant to the dump pipe, it was one of those things you cannot live without. I have never use it in four years of cross county camping.
We started with full hook up campgrounds but always seem to have the whiff of sewer gas from one of the campsites in the park. Now we usually just stay at State or National parks with just electricity and at times water. It opened up a lot more camping options .
Even with full hooks ups we rarely connect the sewer line, we dump when we leave. We do that so we have a fair amount of black water in the tank to avoid the dreaded poop pile. So too the gray water so we can flush the black water from the slinky, then rinse it. I prefer to do this at a dump station rather than at the campsite. Rinsing the slinky splashed water all over.
As far as winter tank drainage is concerned, we dump the black and gray water before storage and drain the fresh tank. What little water remains is not enough to damage the tanks when it freezes. Plus, it picks up the excess antifreeze when we winterize the fresh water lines and drains.
In the spring we do the standard fresh water spring bleaching. The hot water tank drains from the bottom, leaving little water. After bleaching the fresh water lines we open the bypass. Our hot water is very very hot, so sanitizing it is not necessary for us.
Good luck
