Some of the benefits I've found:
- My hose doesn't et all muddy if it's a rainy patch and there is not gravel between the drain and the tank valves.
- I can let the hose touch the ground when it leaves the valve and then put it on the support, creating a trap of sorts. This allows me to leave the gray tank valve open without worries of sewer flies getting into the tank or the trailer.
- Protects the hose from getting punctured, scraped up on gravel/blacktop/concrete or something sharp laying in the grass.
-Can make draining easier if the ground is pitched the opposite way.
Just a few. None earth shattering and I can see that some don't feel the need to have one. To each their own. I like one when I have FHU's.