You would need to mount it in a way that someone couldn't just come along and pick it up and go. Any mounting solution that requires internal access to undo would be a further deterrent.

Cameras would help too, and if you have either a very strong router (like a Ruckus), or cellular service, you could even potentially get notifications from the camera, prompting you to walk back because someone is attempting to unmount your stuff. Even just talking through one of those doorbell cameras will probably make them scurry off.

Even if you just slapped a simple chain bike lock on everything before you walked away that's probably going to stop most if not all attempts at stealing your stuff.

Most new RVs these days come with panels, they're screwed into the roof. Could you steal them? Sure, but it's probably more of a pain than the panels are worth. The Starlink is a different story, perhaps. Mine will be mounted on a pole attached to the RV, and taken off for travel anyway, so if I leave the RV unattended for any length of time I'll just stow it.

Battery theft is definitely a real thing these days, too, especially with expensive lithium batteries, so mine are in a lockbox to deter casual theft.