Keep in mind that there is no sure way to protect your generators.
Your best bet is to keep them out of sight as best as you can...
All you are doing with the cables and locks is to make it more difficult for them to get it and hoping they will go to the next trailer and steal their items...
The dudes that steal your item all have portable saws and large cable cutters and cut through those safety chains in a heart beat...
In my case I keep my single 2KW Honda Generator sitting secured in the tailgate corner of my truck bed. My truck bed has the hard folding hard plastic panels which are also lockable. The generator is totally out of of sight when not in use... Being in the back of my truck makes the generator go where I go... Never left at the camping spot unattended...
Roy Ken