It was supposed to be a quick flip but then the buyer got wind from the neighbors and did an "informal" test which came back hot.

We'll need a good contractor though, so PM me if you know someone who can get started quick. 

It's over quick.

That extra 1.5k a month could really vanish extremely quickly if you have an issue with a rental property or a tenant.

They can close quick as well which has helped me get deals I would've otherwise lost out on.

I have seen a few parks  empty halfway during the summer time "I am a mailman" That being said there is a market for these homes but the lot rent is going to add up quickly unless you can sell fast and buy at a low cost.

I wasn't expecting these quick responses.

Unless you have a unique way of generating a higher return and can attract investor capital or are investing your own self-directed IRA and buying in cash (most current buyers/hence long horizon), it's going to be tough for you. 

I thought this would be quick and painless, but we have not been able to find any deals.

Landlords get calls and letters very often from "buyers" who offer "quick cash offers."