My 2kW Honda is anchored to the rear corner of my truck bed. Then I have a locking hard folding top bed cover which keeps the generator completely out of sight except when I am using it. Then I just pull it out onto the tail gate. It is still tethered to the inside of the truck bed when running.
What would bother me keeping it inside my trailer is when it is not being used I would be afraid I would run off to do something and leave it unattended at the camp ground. My generator goes where I go sitting in the back of my truck...
Of course no place is really secure but at least doing it this way the generator is with me most of the time and is out-of-sight.
No way would I chain my generator to the trailer leg or frame and go off and leave it in plain view unattended. Just how safe you think this generator will be in this photo.