Google map points are maintained by trucking companies in their private controls when logged in. If a point is innaccurately placed, or if it fails to map a result for the company altogether, it is because the map cannot find a PO Box, suite number, or Rural Route address correctly.
This data can, and is, being corrected over time. If you have questions or problems regarding the specific company location, call the company directly, or visit a company website for further locational details.