That caddy also probably weighed 3 times as much as a bus.
In a light vehicle like a bus, without the weight of an engine in front, those front wheels would lock fairly quickly, causing the bus to dive forward and skid. If you've ever driven a drum-brake bus in a fresh rain, you know. The big difference between drums and discs isn't necessarily stopping power, but stopping control. Discs take more pressure to stop, but the pressure can be varied smoother and they can handle stronger forces with less stress on the parts.
I've not dillied with my bearings, most I've actually had to do, brakeswise, is change shoes. But the hard part is getting the rear drums off and on, so if you've done that why not do more
But be careful. With the torque involved on those axle nuts, each time off and on takes life from the drum as the nut eats away at the metal of the drum. Soon the drum doesn't quite seat right and the wheel will start to wobble.
