I'm with @Marvin McTaw and personally think his lease option as an exit strategy is an outstanding idea!  

3) Will the death and transfer of ownership trigger any default clauses in any loans that may be outstanding?

The repayment terms for a 401k participant loan are equal monthly/quarterly payments of principal and interest (typically prime plus 1%) over a 5 year term (longer if used to acquire your principal residence).Please note that if you take a full $50,000 and then pay back the loan, you can't take another $50,000 until 12 months after the first loan was fully paid back.Per the loan offset rules that went into effect with the 2018 Tax and Job Act: if you leave your job and the loan is current at the time you leave your job but then the loan goes into default because you left your job, you will have until your tax return deadline (including any timely filed extension) to make the loan current by depositing the outstanding balance into an IRA (and thereby avoid the taxes and penalties that would otherwise apply).4) The loan must be paid back in equal payments so making pre-payments won't lower the monthly payment but will shorten the term. 

You only pay interest when you borrow against it and while there is an outstanding balance.I have someone I can recommend, if you want to discuss with a professional.

We plan to up our savings rates as high as possible over the next 12-18 months to put away money for a downpayment on either a duplex, triplex, or fourplex, depending on what the market conditions will be like a year or two from now (if we need to push the 18 months out to 24 months, we are okay with that too if it means finding a better deal later on).For me, personally, I plan on maxing out my yearly contributions to a Roth IRA my father and I set up when I was 16 (I'm now 23 and my portfolio has been performing outstandingly).

You do accumulate an outstanding balance which appears on your credit, but not as delinquent. 

The Line of credit is tied to a zero balance sweep checking account, so every regular checking deposit is swept towards your outstanding balance, saving interest cost.

Typically 2nd mortgage liens are dropped at a courthouse sale so you're just looking at the actual outstanding mortgage amount.The only issues is they don't post this information on the trustee websites until a few days before the sale so you've got to be prepared!

Unless you can get the owner to give you a deed in lieu of the obligation outstanding your interest may be limited to the amount of the lien or mortgage and interest set by law.

My company provides fleet vehicles as part of the job.