Cables, chains and locks may slow a thief down at least. I recently learned of a way to scare them away. I follow a YouTube channel called "Nomadic Fanatic." He drives a class C that has his motorcycle attached to the back. He has some type of motion sensor alarm attached to the bike. The motion of someone trying to take the bike down sets it off, and it has worked to prevent theft. You would have to peruse his videos to find the brand. I think that such an alarm attached to a generator could be very effective.
I have an extra generator, an $89 Harbor Freight Tailgator. My logic is that few people will think that it is worth stealing, and so far my logic has worked.
Miles and Darcey
1989 Holiday Rambler Crown Imperial
Denver, CO