axles

[JR1]

Hello, I have a 69 c20 longhorn and am trying to learn about axles, this truck has giant brake drums, I mean giant, to pull the brake drums you need to pull out the floating axles first. the hub is attached to the brake drum, I am guessing from a lot of the searching I have done on this forum that this means they are 1 ton brakes, as my buddy has a c20 with full floating, but a smaller brake drum and you can slide the drum over the hub to get it off without pulling the axle. does this sound accurate? what rear axle/end would this be with hubs and drums like this?