A cross collaterized mortgage, (encumbrance of two or more properties under a single instrument set) is not a conventional structure.  

Try reading Rich Dad Poor Dad by Robert Kiyosaki to see if that will help.In terms of raising funds for your investing, you may want to look into bird doging or whole saling as well as creative financing solutions such as cross collaterization, seller financing, and property managment.

Do you have any collateral to use such as boats, cars, bikes?

Most lenders will give you a spreadsheet for listing your experience.You can sometimes find one who will use your equity to cross collateralize the rental loan.

Is there ANY collateral for the lender besides the property itself?

I would imagine a decent amount of legal work would have to occur so that the seller has appropriate collateral to make seller financing low risk for them. 

It just takes more to convince the bank to lend on you.The biggest plus to having no debt on the land is you get to use it as collateral for your construction loan.

As I hear more and more about little-to-no money down investing, I wonder how feasible it is for someone who does not have much collateral.

For example, if there is currently a loan to that entity and the property is collateral, a sale of the entity will quite possibly trigger the Due on Sale clause that's probably in the Security Agreement / Mortgage / Deed of Trust on the property.I highly recommend you get a lawyer if you don't already have one.

My husband and I own a duplex outright in Tacoma, the duplex has a third non-conforming unit in the basement. And the property is zoned as RCX, mixed use. We would like to convert the existing detached garage into ano...