Just swapped out a couple of Chumpcar hubs. The early A2 wil break for sure. If your car has 17mm ball joint studs it also has the small hubs.
87 and later seem to last about 5000% longer. Torque the nuts to 250#, not more. If you over torque/ you will break the axle stub and the hub. BS happens then..
I would hope that the chumpcars are using the A3 hubs and brakes.