The only place I've needed a sewer hose longer than the rig have been in 'highly rated' commercial RV parks. But I've needed longer than the standard 15 ft often.
My dump location is 10 ft from the front of the 36 ft TT. Right now I'm at a COE CG with the dump location at the back of the spot - and am using 25 feet to reach it.
I've also been in a place where the dump location was at the front of the spot - a full truck length (22 ft) infront of where I had to park the TT.
I was at a 'highly rated' commercial RV park where they wanted the front of the rig at a certain location on the pad. The dump location was actually 43 ft behind my dump valve.
I carry a standard 15 ft Rhino, and four (4) five foot long extensions. I also carry a spare 15 ft Rhino in the rear bumper. My main hose is in a plastic pipe holder near the dump site. Three extensions all fit nicely in a plastic trash bag in the storage compartment. The other is in the rear bumper.
Carrying extra sewer hose is easy. And a lot easier than having to go buy some right after you setup.