I think you should have 2:
- One which you use to bury #2
- Another to help get your vehicle unstuck
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The Gerber is only about 1foot long when extended so it's way too small to unstuck a vehicle. But it works well for what I described. An E-tool makes a viable candidate but it's quite a bit more robust (read: heavier) and since it is still too small IMO to unstuck a vehicle, and too bulky to carry around just to bury #2, my vote goes with the Gerber. The Gerber's lighter nature also bodes well for hiking if you're so inclined.
A short fiberglass d-handle shovel is easier to pack and works well enough but like others have mentioned, it won't do such a good job digging in rocks or root bound soil.
Since most of the stucks I have seen/ experienced involve snow or melting snow + dirt (mud), a short handled shovel has done the trick when there is nothing to connect a winch cable.