@Rico Nasol you will want to consider options for both onsite and offsite management as you consider the strategy for a park.
As it relates to the onsite manager, the generic strategy is to interview the existing tenants to find a capable, trustworthy, willing person to be your manager. That will be an okay strategy if the park is nearby and you can oversee it. However, don't expect to get much more than a person who collects rent, interacts with the other tenants, and watches over the park. This strategy will work for smaller parks or a park that is full of tenant-owned homes and doesn't need much work. I would not suggest this generic strategy for a larger park or parks that need a lot of work.
For value-add parks with vacant park owned homes, vacant spaces, and one that may have been previously poorly managed and in need of a lot of work, the generic strategy above will not allow you to move the needle much. The alternative is to hire a full time onsite manager capable of performing all the duties of management, home sales, managing maintenance and repairs, and the implementation of software systems and processes that will eventually have the park running like a Swiss watch. This kind of manager will cost more money, of course, so a smaller park may not be capable of affording that kind of horsepower. Usually, the break even point tends to be about 40 lots before a full time manager is warranted. If you can afford a great onsite manager, particularly one who has experience turning parks around, they will make your life a LOT easier and will be well worth your money.
As it relates to offsite management (3rd party management) we have found that this solution only works if you have a a park that is already stabilized and running at or close to efficiency. Also, if you choose to go this direction, make sure to find a company who specializes in parks and is familiar with all the state regulations. Hiring a PM without intimate knowledge of parks is a recipe for brain damage. If you have a park that requires heavy lifting to fill spaces, sell homes, complete major capital improvements, etc, I would not recommend a 3rd party. They just don't have the ability to move the needle at the park, nor will they care as much as you do as the owner, so you will be left disappointed with the lack of performance.
If your focus is to acquire value-add parks that require a lot of work, I would suggest YOU become the expert and take the role of offsite manager, overseeing the onsite manager. That will allow you to stay engaged with the property, move the needle, and give you the freedom to acquire more parks. Take the time to learn all the ins-and-outs of parks, to include filling up spaces, renovating homes, selling homes (along with licensing requirements), carrying paper, crafting the correct leases and notices, establishing the right park rules, proper tenant communication, metering of utilities, and the list goes on... You can gain that experience through education, mentorship, and running a park yourself of course, but the goal is to become the expert at determining and executing the right strategy for a park.
As it relates to management, just remember that your ability to move the needle will be directly related to the quality of the onsite manager and your ability to provide the proper leadership, goals for the park, and resources/support to achieve them.