Depends on your definiton of "important". For most of those who do have one, it is a convenience - no need to manually crank the tongue up and down when hitching and unhitching. But the standard jack that comes on the TM is very adequate for this purpose.
If you are physically limited in some way that would prevent you from cranking the manual jack, then it is important. Similarly, if you are physically limited in some way that makes it very hard to raise the shells, the jack can help by raising and lowering the front of the trailer, which can make it easier to open the shells.
I have no figures, but I would imagine that perhaps 5% of us have an electric tongue jack.
Bill
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