Hi there, not all that pleasant of a topic but I have a question.? We have a 1998 35ft class A winnebago adventurer, and on 2 occasions while using the bathroom while driving air was being forced up through the toilet while flushing.? When I brought the rv in to our local service dealer (also had trouble with the roof air) I was told that there was nothing wrong with it, the bathroom is not meant to be used while driving.? Prior to this rv we had a 1990 winnebago warrior class c for 5 years and I always used the bathroom while traveling and never had any trouble.? I called another local rv service center and was told by them that as long as the water pump was on and there was plenty of water in the fresh water tanks that you can absolutely use the bathroom while traveling.? There may not have been enough fresh water at the time of the 2 incidences but our service center didn't even mention this as a possibility.? My question--can the bathroom be used while traveling?? any comments would be greatly appreciated.