I get as close as possible. All the four wheeler trails here are on the top of the hills and I usually have my stand on the side of the hills so I have to walk a little ways, not much though. The deer here are used to them, they walk on the side of the hills and usually can't be seen from the four wheel trails.
If I were you I would get to the stand at least 30 minutes early and drive as close as possible and you should be fine.