Back in the 70's/80's I worked on Explorers when they were still in service. We had the hub tools, the spanner resembled a large tube, probably at least 5 inches in diameter and from memory a couple of foot long, one end had the hexagon ring in it to fit the nut, the other end had a very thick steel bar welded at one end to the tube, about 3 feet long. There was also a heavy length of timber, cross section similar to a railway sleeper with one end radiused concave. This was stood on end to support the bar end of the tube. One man would hold the spanner on to the nut and down on the block with the other man wielding a 14 pound sledge hammer on the end of the bar. That is how tight it had to be. Once the nut is off, the hub puller consisted of a modified axle hub cap with a large diameter screw threaded in to it, with the hexagon head same size as the hub nut. Spanner and block refitted and sledge hammer applied again to release the hub off the taper.
The hubs have to be very tight as the key should not be taking the load, it is the taper fit that does that. If slack the tapers will wear and never lock together. I recall having to replace badly worn shaft and it took about 50 tons on the press to release it from the gear wheel. Hard work, but loved working on these old girls!