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When this sort of thing happens to me, I always try move_objects first.
If it recurs, examine the lots and circumstances under which the problem occurs. Is the road uneven? Back up your game and use Mootilda's Lot Adjuster to flatten it out. Does it only ever happen with delivery trucks, but always happens to delivery trucks? Perhaps you have a mod or hack which interacts oddly with other mods or hacks and creates the problem.
backup your game, take out your downloads folder temporarily, and have someone call a delivery truck. (Don't worry, you can put the Downloads folder back in later, along with restoring your game from the backup.) Does it only ever happen to one family in one lot? Perhaps the lot is glitched - back up the game and try moving them elsewhere.
If that leads you nowhere, go to the Help drop-down menu and work through the steps of the FAQ - work, not read - and if that doesn't work, post in the Help forum.
But I bet move_objects fixes it and it never happens again. Because stuff happens.
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