I use a combination of "rollover" rental income (basically taking any net income and plowing back into the next purchase, snowballing maybe?)

Also another great idea to roll over the balance onto another card with no fee, just to buy time.

http://www.irs.gov/Retirement-Plans/IRA-One-Rollov...Basically one rollover from any acct once every 365 days as of 1 Jan 2015.  

You would have the IRA transferred (rollover is the correct term), and then at the new institution she could direct them to invest in a loan to you.

Refi was my plan B, I spoke with a guy in Phoenix doing something similar and he said if all fails ask my lender to roll over the loan in another term.

I can roll over these accounts into something more flexible once I leave my employer as well.Lastly the biggest thing that you seemed to have missed on is that if I have $500,000 in my retirement accounts at age 40 when I want to retire I could start making withdrawls penalty free at whatever age I choose if I utilize the program to its fullest potential.

You could do partial rollovers from your TSP to your IRA and then convert that to Roth.

Is it feasible to roll over my 401k contributions monthly or semi-annual to pay the mortgage on the land?

So, we are NOT house hacking, we are NOT going to do the equity rollover to each new property, and our plan is to use our fairly large income sources to buy turn-key income-generating properties for long-hold to increase overall wealth in our investment portfolio.I really look forward to getting some more learning in about how to best achieve our goals!

@Hunter Eidmann,You can set up a self-directed IRA (or Solo 401k if you are eligible), you can fund it with new contributions (subject to annual limit of $5,500) or rollover from another qualified retirement plan, and then IRA can invest in real estate, but it can't be a property that you already own, has to be brand new investment.