bob b wrote:
It seems to me that blocking the drain hose so that it is in a perfectly straight line may not be a good idea.  I'm sure that it may drain more efficiently, but, you are loosing the natural trap formed by laying the hose on the ground as it needs to go back up at the fitting on the end of the hose.  What am I missing here?    Bob
Well, yes and no.. First in some areas (Clark County, NV for example) you are required by law to support the hose in such a manner.  So you do not have a choice.
Second: You have closed valves at the RV end of the hose, air tight seals all the way, so what's to trap?  There is no path for anything to escape the sewer into the motor home or beyond.   Open the dump valves only when dumping.