First let me give you a congrats on the new 357!!!
Now one thing about sewer hoses they are all dirty. And we all as rver's have to deal with it some time or another. This is my opinion and what I did for my hoses. I have been camping for 35 years and have seen all sewer hoses fail, dry rot, or just plain out come apart. There are many options out there from $10-$500 for it. I myself had a camper before with a bumper and I stored my hose in it. I'm not gonna lie it was a pain in many ways from it sliding in far enough not to be able to get to it, metal tubing and vinyl don't mix well. So on to how did my TH sewer hose and holder.
Mine came with a 26" long EZ hose carrier installed on the sewer side not far from the drain. So I took it down and added another. The best hose for ya money I have found is the EZ coupler red hose. The reason for 2 was they come in 10' lengths and one will fit in a 26" carrier. This allows me to have 20' or if I'm close to a sewer connection I only use one. Also the EZ coupler hose is available most any where. I also use a slunky hose support.
Hope this helps anyone that's looking for a DIY install.
LSU TIGER FAN
2013 FUZION 310
2012 GMC 2500 HD SIERRA DURAMAX 6.6L