Purely an assumption on my part, but I am under the impression Lippert makes the trailer frames for Jayco. There must be a sticker or stamp somewhere on the frame, though I must admit I have not seen any on my HT fiver.
I'd love to know if your hanger had more than one hole for the springs to allow for height adjustability. My HT does, and the springs have to be set in the lower holes if you have the 16" wheel/tire option. I noticed my front and rear hangers had no weld or bracing to reinforce the bracket. I saw that the Lippert Correct Track axle alignment aftermarket kit comes with a metal insert to bolt in the upper, unused hole. Obvidously, this was designed to act as a stiffener to avoid exactly what you experienced. I added my own similar metal spacer, but wonder if welding a brace would be a better idea. I noticed the center equalizer frame bracket does have a welded brace.
What does your replacement hanger have for bracing?
2020 Eagle HT 30.5 CKTS Modern Farmhouse (16" wheels, spring shackles set on lower hole of frame, SumoSprings TSS-107-40, standard kingpin, B&W Companion slider, TST-507 TPMS)
2019 F250 SRW SuperCab 4X4 SB 6.2 (10,000# GVW) 3.73 Axle 18" wheels