The fact that you find out they are a convicted drug dealer is irrelevant since you will not be using that as a reason to reject.Take care to protect your business interests above all else or get out of the business in Seattle and other anti landlord jurisdictions..

I am considering selling the trailers to the residents, but as parks are my main investment focus, I do not have a dealer's license to handle all of the transactions.

We primarily purchase from note dealers and we don’t broker, originate or wholesale notes.

Dealers, Brokers and Community Owners: Do You Need Wholesale Inventory?

First stop is your local dealer whom you offer him the opportunity to park one of his models on the property and pay you rent.

Like fees car dealers tack onto the price at the last minute - "make ready charge" and junk like that. 

There are all kinds of ways you could buy or control these gems, different techniques could be applied to facilitate transactions, but unless you understand the product you'll fail at being a successful dealer because you won't understand why they are valuable or why there is a demand or why the market acts as it does. 

I've spoken to a few dealers in the area, but I'd like to hear if anyone has a referral. 

Here are a few thingsSeller financing with multis with investors that understands seller financing is much easier then single-family houses; no Dodd Frank when investors buying from an investorIf it needs work on a multi, and you know values well and you can price it well, don't forget you can do a joint venture with the seller, by subject to and a note, fix it and resell it, but you need to get private lender funding for the rehabRegarding single-family homes remember thisWe are here to make a profit either on price or termsRegarding price if we don't get it at 20% discount or more I think you're being a foolYou make the money when you buyThink of a car dealer: what did they say when you try to bring your car to their lot and sell it to them?

It keeps my holding LLC from being declared a dealer if I do flips, and it lets me split off the rehab expenses in a controlled fashion so I can have a legit business to hang a solo 401k (that can invest in RE).