If you plan to build your rental business on credit, you need first establish at least 4 credit lines for 7 years and pay everything as agreed.When you start receiving 0% offers for 12-15 months - you know you're getting better.The higher your limits on credit cards - the more banks trust you.

As the custodian, they are a processor, and will hold funds, sign documents, issue payments and receive income at your direction. 

See simple cal calculaton below:Cash received when refi = 196k* 80% LTV = 157kCash after HML payoff= 157k-75 = 82kCash after refi fees= 82-2k= 80k. 

I am continually receiving calls from the park manager that my tenant is destroying my trailer and park.

I received the tenant's security deposit at closing.

He has reiterated to me that he has "not received the refund of [his] security deposit."

The basic acts of screening tenants, signing leases, paying the bills and receiving the rents are administrative in nature, and if in a modest amount would not likely be viewed as providing services. 

I had received a quote about a Comelit system but I can't find any information about them.

Even as a new investor, every body has some type of value to offer, it could be money for one of his investments (which could be less than you ever think it has to be), could be time and effort that you can offer him to find more deals or maybe you have a construction background. 

Here are the laws in regards to this stuff.4735.01 [Effective Until 3/20/2019] Real estate broker definitions.As used in this chapter:(A) "Real estate broker" includes any person, partnership, association, limited liability company, limited liability partnership, or corporation, foreign or domestic, who for another, whether pursuant to a power of attorney or otherwise, and who for a fee, commission, or other valuable consideration, or with the intention, or in the expectation, or upon the promise of receiving or collecting a fee, commission, or other valuable consideration does any of the following:(1) Sells, exchanges, purchases, rents, or leases, or negotiates the sale, exchange, purchase, rental, or leasing of any real estate;(2) Offers, attempts, or agrees to negotiate the sale, exchange, purchase, rental, or leasing of any real estate;(3) Lists, or offers, attempts, or agrees to list, or auctions, or offers, attempts, or agrees to auction, any real estate;(4) Buys or offers to buy, sells or offers to sell, or otherwise deals in options on real estate;(5) Operates, manages, or rents, or offers or attempts to operate, manage, or rent, other than as custodian, caretaker, or janitor, any building or portions of buildings to the public as tenants;(6) Advertises or holds self out as engaged in the business of selling, exchanging, purchasing, renting, or leasing real estate;(7) Directs or assists in the procuring of prospects or the negotiation of any transaction, other than mortgage financing, which does or is calculated to result in the sale, exchange, leasing, or renting of any real estate;(8) Is engaged in the business of charging an advance fee or contracting for collection of a fee in connection with any contract whereby the broker undertakes primarily to promote the sale, exchange, purchase, rental, or leasing of real estate through its listing in a publication issued primarily for such purpose, or for referral of information concerning such real estate to brokers, or both, except that this division does not apply to a publisher of listings or compilations of sales of real estate by their owners;(9) Collects rental information for purposes of referring prospective tenants to rental units or locations of such units and charges the prospective tenants a fee.