Absolutely not.Will they be beneficiary to you in the long run?

The title is held in a land trust and the beneficiary of that land trust is the sub series. 

Sometimes, it's an LLC (or Trust) with 25 different Managers (or Beneficiaries.)

. :-)  Usually the beneficiary interest is transferred vs selling to end buyer.I still do not like this method - but with the DOS issue, it may be a necessity.

Anything placed in a irrevocable trust means it's no longer yours, it becomes the property of the trust/beneficiary, and you can't take it back, borrow against it, or benefit from it, the very minute you place it into the trust. 

What about in the case of you being a beneficiary of a rental property that has a mortgage in the name of the trust and it is not going to be your primary residence?

It's really the same as the bank, except you name the seller as the beneficiary.  

First when i hired my CPA i wanted to know if they were a investor personally, and yes they should help you maximize the tax advantages as well as from a tax perspective if it is better to hold the property in a entity. they should also have a reasonable amount of knowledge of the ability to leave property to your beneficiaries, while maximizing tax advantages. 

There may be a lot of challenging issues with heir's or beneficiaries or debtor claims and you don't know what the circumstances are..Good luck...

Your 2, 3 and 4 are not matters that can be best set by stating one structure is better than another, it needs to fit the goals and needs of the owner/beneficiary.