Navigate to the "Vehicles" page from the Main Menu on the left
Click on the name of the Vehicle
From the specific vehicle's page, click the downward facing arrowhead next to "Edit"

You are presented with options, "Unpublish" and "Remove".

Unpublish: Removes the unit from your website as well as Outdoorsy.co, but it remains in your internal Wheelbase system and all the information remains.
Remove: Completely deletes the vehicle and all of it's information from your website, Outdoorsy.co, and your Wheelbase system, as if it never existed.