Be careful as you are no doubt aware these assemblies are not light.
Here's a sneaky trick to try if you do have to pull the hubs to get the drums off. Put the wheels back on, and just jack the axle housing up enough to slip a piece of plywood or a steel plate with a little grease on it under the tires. Once the bearing retainer nuts are removed, slide the wheel, tire and drum assembly off the load tube by rocking the wheel assembly side to side a little at a time. It will slip right off when you get the axle tube positioned properly. I changed untold numbers of 18-wheeler axle bearings that way out on the side of the road, when I ran a 24-hour Diesel shop.
Jerry