Tanks and siphons
I got tired of holding up 5 gallon jugs and waiting for them to empty. I found a grey water tank and fresh water tank on craigslist. I mount them in my truck, and can fill the water tank from a spigot.
For a siphon to work, the top of the tank you're filling has to be lower than the bottom of the tank you're emptying. My fill hole is high, but if I stick the tube far enough down the fill hose, it gets below the bottom of my truck tank. The key is to use a small plastic tube instead of a hose. You don't care how long it takes to empty, because you're inside having a beer.
Camping near lakes, I don't like to dump my grey water out on the ground. I use a pump system to pump into my truck's grey water tank, and dump it at the dump station.
2009 Roo 21ss + 2007 Superduty 6.0