Employment advice comes free and fast. Before you blindly follow what someone tells you, look at his success (or lack thereof). Your role model, or mentor, should have experience and accomplishments.
Do you want to be like the guy giving you employment advice? Sit around a campfire, and sooner or later, someone is going to bring up work. Only they'll probably call it "the W word," as if it is something dreadful. Then, even though he isn't working, he'll tell you what you need to do land a job. I suggest you'd be better off following the guidance of someone who is working -- and is happy his job. The guy who can't find a job, or a job that pays what you want to earn, is not a good role model for you.
Join an online chat group or forum about working at campgrounds, and you'll get all sorts of people telling you what you need to do. Where to find ads. What to put on your resume. How many months (or years!) in advance you need to apply for a particular position. Before you take what they say to heart, look at their qualifications. Have they ever had campground jobs that they liked? If so, are your reasons for wanting to work in a park the same as theirs? Do you want the same kind of situation?
When someone offers you employment advice, consider where he is coming from and what his motive is.
Is his perspective that of an employer or an employee? Does he see things through the eyes of someone doing the hiring or someone looking for a job?
When someone tells you jobs for RVers don't pay more than minimum wage, ask him how much he is making. Chances are he's making minimum wage or less. Or, he may be representing people who pay substandard wages or expect volunteers. Either way, he is wrong. Taking employment advice from him isn't a good idea -- unless you want to make what he's making.
People give advice based on their personal experiences. Find out more about someone before you take employment advice from him. Has he ever been paid for all hours worked and received an RV site, too? Has he ever worked for non-profits? Has he ever volunteered for a site? Has he ever been a working RVer?
If someone is telling you about construction jobs, has he ever done any construction work? Is the person telling you how to be a flea market vendor a success flea market vendor? Has the person telling you about caretaking ever done any property caretaker?
What about running a business from your RV? Is the person giving the advice a successful business owner? What qualifications does he have to be your business coach?
Your employment advisor doesn't need to have experience in everything. Look for positive experiences in general categories. Look for success.
Follow the lead of those who are where you want to go, and you have a better chance of getting there than if you follow those who haven't yet found the way themselves. Take your employment advice from those who have already achieved, or at least are in the process of achieving, what you want.