As we are fixing up the parks and selling manufactured homes in spaces, we have been using seller financing since traditional financing is very difficult and expensive for the buyers.

Your State's manufactured housing association is best suited to answer that question, since they can give more color to the federal statues and whatever your state laws say. 

I am trying to sell a manufactured home my wife has owned for roughly 13 years. 

due to drug manufacture. this may be a deal breaker for my wife.

Looking for advice on how to...if possible...tap into the equity of a manufactured home I own as an investment property. 

I work with some projects on container homes with a container manufacturing company in Vietnam and the price is around 10k-15k for finished one (include plumbing, electric, flooring etc.).

We also have a decent manufacturing base (Nissan has a huge complex, Berretta just moved here, etc). 

We have found it is much easier to resell manufactured homes on lease options.

I specialize in manufactured housing and some communities have the same problem regarding entrances.

Yes, Home Depot has a bid room for Pro accounts and anything over I believe $2500 can go through the bid room.We are picking finishes for a 284 unit deal we are closing in a few weeks and looking at ordering via HD Supply.Some items we may source directly from the manufacturer in China.