I have 2, 10 foot sections of sewer hose. I usually only need one unless I misjudge the drain at the dump station.
Wtaer hos I keep 150 feet and use every bit of it every time we go. This year I switched to that green pocket hose that shrinks up to nothing when you turn off the water. It takes a few extra minutes to fill the tank with it due to water volume capability of the hose but I can fit 150 feet in a 2 gallon pail.
I also keep a 20 foot garden hose for the black tank flush system to use at the dump station.