You say 62 lots but the numbers don't add up.
The expenses are way, way off. You must model them carefully. I'd estimate (first cut) $75k NOI on $275k gross. Just my experience based on number of POH & turnover. You don't say how much you're paying, but assuming a $1 million loan this leaves you about $10k return on your $500k down payment. 2% cash-on-cash.
Your loan may be bigger.
Slightly more optimistic approach: You have about $260 average lot rent on which you're going to clear $130 times *62 lots? or 66? and the rest is "gravy?" That comes out to about $103k which would leave you about 40k return on your 500k d/p which is 8%.
Are you going to collect 100% of the potential gross day 1? Probably not.
What do you expect your NOI to be? Take that and subtract your debt service. Figure (you hope!) principal paydown on debt service equals capital reserve budget, so that's a wash. Whatever that number is, divide by your down-payment (plus other out-of-pocket closing & startup costs!) to see your cash-on-cash return (cash out divided by cash in).
That gives you an expected return. People in this Forum talk about high teens and mid-20's, but those are pro-forma and the reality of driving a park to a 40% expense ratio can be a bit jarring. It's not always so easy as it sounds.
DEMAND is the key driver of how much control you have, how much leverage you have over the residents to make sure "my way or the highway" is the rule.
And once you have that cash-on-cash number in your mind, don't forget there is VARIANCE! What is your best-case? If you model your expectations on the best case then you will surely be disappointed. Be sensible and realize your best-case scenario is not likely. What is your worst case? What are some of the other possible headaches/issues/aggro?
Calculating your expected return means little if you do not consider the risk you take in order to reach for that expectation. And your aggro and time are worth something too.