Question about sewer hose supports

I use them all the time.......if I'm in one place for 3 days or more. Many places have the connection above ground, a few I have seen are 12" above. Most are 3" or so. One place we go to has the connection at ground level. There I don't use it because it is a gradual slope to the connection.

And yes get a 20 footer to go along with your 10' section. Only once have I needed 30+ feet! And when you buy a sewer hose they aren't the exact length because they are corrugated. Figure on a 20 foot sewer hose being 15 feet.