I just re-sealed four of those on our '17 Jayco 28RLS. Mine were leaking where the hose slips onto the barbed fitting. Those crimp clamps are great but the barb needs a little sealant on it before slipping the hose on. Since the crimp tool is $60 for a decent one, I opted for some screw type stainless hose clamps for $1. Cut off the old crimp clamp. Slip hose off. Smear some 3M marine sealant on the barb being careful to not get any inside the elbow. Slip the clamp onto the hose and the hose onto the barb and don't gorilla the screw. It will strip. Reasonably tight and let cure. Not an advisor and not telling anyone what to do. This worked for me. Just sharing an idea.
2020 F250 STX CC SB 7.3L 10spd 3.55 4x4
2010 F250 XLT CC SB 5.4L 5spdTS 3.73
ex '95 Cummins,'98 12v Cummins,'01.5 Cummins,'03 Cummins; '05 Hemi
2017 Jayco 28RLS TT 32.5'