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The hopper would fill quickly of course with branches,and it is so heavy, but it may be nice to park it below and drop or rig branches right into the hopper from above, then when everyone is clear, start it up and let it mulch away.
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Way to impractical. The feed bin sits too high, its too big, and it doesn't shoot chips out of a chute, so you can't chip into a chip truck, you'd need a dump truck sitting under the conveyor.
If you want to go this big, go for a Morbark M20 with the conveyor feed system, I've seen a few residential guys rock one that do a lot of big removals. You can chip into a chip truck, the tray sits much lower, so its possible(but not recommended) to hand feed. Its still a big beast, but not as large as the horizontal grinder you posted.