Yes to protect the hose also. A hose exposed to direct sunlight on a hot day with excessive pressure in it won't last long. I am using the same hose that I started with 4 years ago and I full time. My pressure regulator has always been used before the hose and I'm sure this is the reason the hose is still going strong.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof