The best way to get knowledgeable is the MHU Due Diligence Manual. This will teach you about all aspects of a Park so that you can hire the right specialists to complete the needed diligence items and ask the right questions of them (e.g. electric, plumbing, septic, well, zoning, etc). This Manual will help you ask the right questions to the right people so that you can avoid surprises.
There is not a better guide to help you buy a Park smartly: http://www.mobilehomeuniversity.com/mobile-home-park-investing-books-and-courses/mobile-home-park-due-diligence-manual.php