One of mine went bad not long into ownership, in that exact same spot. I had the dealer supply me with a replacement under warranty (with yellow tape and proper hose fittings attached) and I did the labor myself. The dealer was all too happy to let me do the labor because it kept my trailer off his lot and his technicians engaged in more "profitable" endeavors. I dropped by the dealership and picked up the hose after making prior arrangements to do so. Easier than pie!
I replaced the second one last year some time. It wasn't leaking that I know of, but it looked like it was only a matter of time. I could see the rubber bushings all cracked and rotted, so I replaced it because I didn't want a leak.
IMO, the replacements are superior to the OEM Jayco supplies on those pigtails. I've had zero issues since replacing these hoses.
My trailer came with a tank cover new, so I don't think this degradation is a result of exposure.
-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)