We have some what the same but different problem. The water to the bathroom gets cut down to a small stream. We know that the line somewhere under the floor has a bend in it causing the problem. The way we fixed it was to hook up to water before the slide goes out. Run some water to get the air out then open the slide. One of these days I will try and track down the problem but until that happens we just keep doing the water first thing.
Retired and never looked back