So we investigated the issue with the exported car that isn’t working and it turns out it is an issue with the car exporting from campaign. Problem is that this fix will first come in the build that invalidates the campaign saves so we’ll need to do something tricky and convert the campaign to a sandbox database. I’ll have a go at that and see what happens!
Edit: Okay, it looks like you can just edit the campaign save to rename your company to SANDBOX and it will work once you’ve renamed the database to the sandbox db name. That means I can reexport all the broken cars and we should be good.