I have always assumed that vehicles in Star Trek are similarly equipped as vehicles from Star Wars, with repulsor lifts. In SW, landspeeders, probedroids, speederbikes, even the Millennium Falcon, while it's taxiing, seem to have motive power combined with the antigravity aspect. I assume that at least shuttlecraft work the same way. How else do you explain the sorts of soft landing we always see them making. I've thought this ever since I was a little kid watching Star Trek V. the flashy lights under the shuttle, to me at least, always read as a repulsor drive...
--Alex
--Alex