I personally think that the majority of RV'ers are honest. We have never
had any trouble with any kind of theft in the campgrounds we've visited. We have visited surrounding attractions leaving all manor of camping gear outside...nothing that most campers don't already have. I do have my portable surge protector under cable lock and always lock the RV(including storage bins) whenever we are gone for the day. If one keeps valuable items out of sight, honest people will remain so. If you are in a questionable area where the CG is accessible to outside unsavory influence, you may want to take some extra precautions.
If there is something that makes you feel unsafe or uncomfortable, follow your gut and move on. Bob