I've been happy with a Valterra Dominator sewer hose I bought a couple of years ago to replace the typical one. Can't say as it has dominated anything

, but it's very sturdy, and the thing I really like about it is that it will stay "crinked" wherever you set it, even in use. So in other words, if you have a 10' hose, you can "crumple" it in to say, 6' long and use it like that without the entire thing flopping around. Then you can completely "crink" it in for storage, and again it stays that way.
I mounted a 64" long Valterra EZ hose carrier in place of the stock hose carrier (the underneath mounted one not the one built into the wall), and I have a 10' Valterra Dominator hose. Both the hose and the ends easily fit into the EZ tube. I could carry a longer hose as the 10' when "crinkled" is nowhere near as long as the EZ hose tube. I'd be pretty darned sure a 15' Dominator would fit. (Okay, went and looked. Specs say the collapsed 10' hose is 35" long. So a 15' would fit in the 64" EZ tube but not a 20')
I just went and looked at the carrier that Andrew linked to above. Looks nice! I will keep that in mind if I ever want to replace the EZ tube (which is nothing special, but does the job just fine). Manitou, it looks like the middle bear would be the one to get. It goes from 43" to 80". I have a 64" EZ tube (fixed length) and it fits fine but probably could be a bit longer - not a huge amount though. So 43" to 80" seems like a good range. But of course let's see what size Andrew put in.