Best way to collect rent from a MHP?

[Nick Monge]

I'm considering buying a 38 Unit mobile home park.. 33 of them are occupied, 5 vacancies.. 

The current owner (an older man) knocks on the doors to receive rent.. I wouldn't do this, but he says they're all trustworthy tenants and he's never had a problem..

What's a better way of doing this?? I am out of state. Actually, half way across the world..

TIA!