I was using those bearings at least 25 years ago, so they're not new. As one of the posters on that site mentioned, they're a good option on passenger cars or Cowboy Cadillacs that never get a load in the bed. By moving the bearing surface inboard on the axle (increasing the leverage) and having a stress point built in by the worn spot on the axle, there's a risk of breaking the axle off at the wear groove if a heavy load is encountered. Trust me on this- - - -a wheel and tire assembly crammed up into your nice bodywork after the axle breaks off is not something that will make your restoration job look good!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!