About the vehicle overview: there (also?) should be a tabular list on one page (up down scrolling also with the mousewheel), sortable (and filterable) with each vehicle in a line and columns to be discussed (at least name, type, unique id, location, status, level (if applicable), maintenance). Please let this list be editable: change the name, location, colour etc by doubleclick in the cell.
And for the vehicle detail screen: there should be one dropdown list for the location, not three, with all locations that make sense for this vehicle (e.g shuttle bus stop only for shuttle buses) and those greyed out that are not available now (full, disabled etc) and the list should not only contain the name of the location, also some hints on where they are and how full they are.
About the third issue: that’s how some people in my street actually park their SUVs.