For Nomad Skyline trailers manufactured from 2008 onwards, the VIN can usually be found on the following two places:
On the driver's side front wall of the trailer, near the top.
On the inside of the main entry door, usually on a label or sticker.
Check both locations carefully, as the VIN can sometimes be hard to spot or obscured by dirt or grime. If you have difficulty finding the VIN, you can also contact Nomad Skyline customer support for assistance. They should be able to provide you with the VIN based on the trailer's model number and serial number.