Those numbers are tough. Your annual gross income on a lot is only $1,500. Being so small, I hate to guess what your expense ratio is, but if you pocket 60% = $900, meaning such a move in would cost you 4.4 years of a lots production. That is a tough call, like I said. But one thing I have learned as a park owner is that you always need to be filling lots or the vacancies will accumulate and things start to get bad.
This is not 100% true, but it serves you to think of it as if it is: the profits are all in the last few units in your park. Or maybe a better way for me to say it, think of the lot rents in the last few lots as all profit and the other lots’ rents going just to support the expenses. Sure it is not 100% true, but it is close and helps motivate you to fill lots and retain homes. In your 10 lot park when filled, you might think of it as in loosing a home you loose 10% of your gross income, but more importantly you are loosing, say, 25% of your profits.