We are living in a pretty major metro area, near several State Parks and there are lots of major events in town. We rent about as much as we want to - if we make the camper available, it is generally rented (in season). We do not use Craigslist, nor do we consider this our "business" as much as a side-hustle that basically pays the camper payments.
One thing that you have to consider is that many state parks are starting to crack down on RV rental deliveries. It’s ok if renters take them into the park themselves. But a lot of them are not allowing deliveries unless you have the proper vendor permits.
Check into delivery requirements to your state and federal parks too.