My primary residence is in mine and my wife , the investments are in my name only , the reason , you cant attach joint property so If I get sued and lose they cant go after my primary residence .

Create a joint venture within the trust to fund in the project so that this investor would put up the risk after being directly qualified with the peer to peer funding group so that I could utilize my own funds elsewhere.

JV (Joint Venture) / Partnerships That is what I can think of off the top of my head.

Do you have a ton of cash to use or are you looking for a joint venture etc... 

How is title held in Joint Venture projects with multiple investors?

Your last dollar (assuming > $250K AGI, married filing jointly) would only get the medicare part at 3.8%. 

My husband and I are renting a SFH to two guys as a joint tenancy.

Requirements for a Delayed Financing Exception✓The original purchase transaction was an arms-length transaction.For this refinance transaction, the borrower(s) must meet Fannie Mae’s borrower eligibility requirements as described in B2-2-01, General Borrower Eligibility RequirementsThe borrower(s) may have initially purchased the property as one of the following:a natural person;an eligible inter vivos revocable trust, when the borrower is both the individual establishing the trust and the beneficiary of the trust;an eligible land trust when the borrower is the beneficiary of the land trust; oran LLC or partnership in which the borrower(s) have an individual or joint ownership of 100%.

What's the difference between syndications and joint ventures, is one more restrictive than the other or ? 

I have 2 builders that would like to do a joint venture.