To be honest I do not send out a lot of letters and do not mass send things out so maybe I'm the wrong person to listen to.

Also, try to see if the lender will allow to buy under LLC for better assset protection; by doing personal gurantee. 

The borrower is not personally liable for the loan, and the lender cannot seek additional repayment beyond the collateral.Since the borrower is not personally liable, they can choose to make larger or additional payments to pay down the loan faster if they wish.

Spreading your risks is always a great approach.

Personally, I've been in the mobile home investing business since 2007.

And while grabbing an owner-occupied loan is typically a non-starter in a standard 1031 transaction, this is a mixed use property that does include a personal residence portion. 

Are they different for rental property vs personal?

And with you using one of the units as an office would not eliminate the fact that you are 'disqualified person'.

Does having an LLC simplify any of that vs doing it as part of my personal return?

To further complicate the process, this demand notice must now be attempted to be personally delivered to the tenant two separate times, on two separate days, before it can be legally posted upon the property.