I'm told to put my investment into a Trust fund so that I'm protected.  

Following are the similarities and differences between the solo 401k and the self-directed IRA.The Self-Directed IRA and Solo 401k SimilaritiesBoth were created by congress for individuals to save for retirement;Both may be invested in alternative investments such as real estate, precious metals tax liens, promissory notes, private company shares, and stocks and mutual funds, to name a few;Both allow for Roth contributions;Both are subject to prohibited transaction rules;Both are subject to federal taxes at time of distribution;Both allow for checkbook control for placing alternative investments;Both may be invested in annuities;Both are protected from creditors;Both allow for nondeductible contributions;Both are prohibited from investing in assets listed under I.R.C. 408(m); andNeither may be invested in your own business. 

It seemed like a good idea at the time to have all our future assets protected and a corporate veil that came with encorporating with their company in another state.

And, do I need a Pour Over Trust on top of that holding company to protect myself further?

You just need to make sure your contract includes provisions to protect the deal from your perspective.A few things to consider.  

You need the insurance so as to create the Loss Payee clause protecting the HELOC.

We did have the contingencies in the contract, so I was protected, but nervous to get to closing and then not go through with it.It should have been much quicker for the eviction process.

Asset protection is too important to do it yourself, then 'hope'  it holds up in court.  

How can I protect myself? 

Some privacy protection law thingie means that when I pull that title report today, none of that stuff shows up.