I saw one in a local safe shop. It reminds me of a basic gun-locker, such as a Sentry, Homac, etc. It was not very heavy duty. Though it should offer better protection than a looked door/ room.
I would look for a clean used gunsafe, then just sell it when you leave. There are some compact models out there on the used safe market.
Or; just secure them inside your vehicle. A secure/ alarmed storage facility is an option as well but cost may be an issue in some areas.