I'm pretty sure all of this was discussed during that episode. She had the shipping manifests showing what car carried what contents.
yeah, it was. she covered it in pretty good detail, exact times, etc. i'm assuming ksu-w was confused about how they knew it wouldn't end up 100 yards on either side of the bridge of something, which doesn't seem like a big deal IMO 
No, I remember Lydia saying she would get the manifest sometime between midnight and 2am, giving the crew at least
6 hours in advance of the heist. That's not nearly enough time to measure the track and bury the tanks in the right spot. If you re-watch the episode, the crew does all the prep work, measures, buries the tanks, etc., then Walt has an evening conversation with Skyler, then Lydia gets the manifest at night, then it's daytime again and time for the heist. So at least a day passed and the crew definitely buried the tanks before they had the manifest and location of the car.