Rental Units in a MHP

someone please help me out on this one. I posted a topic a few weeks back stating I was looking at a park where half of the 60 units or so were rentals. The responses seemed to state that was not a big deal and that many people have made money with rental units but I am reading some of the articles written by Frank & Dave that say otherwise. That rental units are money pits. Would this kind of scenario be a poor decision for my first park? Is there a strategy for turning those rentals into tenant owned homes?

Thanks for everyones help!