I also see that on Manage → Members → User Accounts the Export to CSV link does show vehicles.csv as the file to download. I will get that over to the dev team so they can look into it. The best way to get exports of data from TT is Manage → Reports → All Reports, you can create custom reports that just include the information you are after.
For those that you have imported into TT and you want to send an e-mail you can do that from within TT, if their e-mail address is all ready in you can use Communicate → Send an Email and then choose whomever you want to send to can be multiple.