Playing devil's advocate - 15 homes is a lot to move out. Giving the Lonnie Dealer notice on all of them at the same time would put him / her in a pickle. Not only do they have to move the home, they have to find a new place to put it and then rehab it, re-deck, re-skirt it for a new tenant. If they don't move them you can take them through the process to take possession. Also have to consider where your lot rents stand. If you're the cheapest in the city then they can complain all they want but you're still the best deal around.
Need more information to figure out what your likely outcomes are on this one. As other people said definitely carries added risk however you look at it, and should price that in based on your findings.