newbie question about extended stays

There's no problem with coming and going since you've already pre-paid for your site for X number of nights. Small class B RV owners do that all the time, and we tend to have simple setup/teardown routines and fewer problems parking while out & about.

Some of us leave items behind like chairs to indicate the site is in use - or carry an orange cone with something like "site occupied" stenciled on it, especially for public campgrounds where people pick their own vacant site and then put their money in an "iron ranger" drop box.