Protected USB connectors?
You mean like this?



These are really just normal USB connectors, but with a strong, waterproof connector over the top of them. This holds them in place despite vibration, protects them from mechanical abuse, and keeps the water out.

I think the key word you need is 'industrial'.  Farnell stock a bunch of them.

Also, take a look at the Bulgin datasheet. From this, you can get the part numbers for the panel mount, and cable mount versions of the connector.