It's not Jayco being cheap. The Ford chassis, even though shipped as "motorhome prep" comes with those cheesy bars. There may be a motorhome builder who upgrades the suspension (either as standard or option) but I don't know of one that does sway bars, track bars or steering stabilizers. It seems some, though, might do something about alignment. Our Jayco has non-adjustable offset ball joint bushings. Harvard's has adjustable Ingalls bushings. It's possible both factories installed those.
And you're right - Hellwig has changed the End Link arrangement on the rear sway bar. Ours uses a heavy bracket that bolts in two holes each side. One is the hole your link attaches to, and the second is the square hole your photo shows below it. Yours looks like Roadmaster. I wonder what your front bar end links will look like. Ours has flat steel plates connected with 1/2" bolts. Roadmaster had a casting.