I have liquid money but would like to not rely on (or use) that too heavily in the case of vacancies, unforeseen repairs and things like that until I can save for those types of events.

I’ve been told by a tenant that everyone uses the water hose to fill up portable pools,wash their vehicles,spray the sidewalk and driveway.When my lease clearly states NO CAR WASHING on property.

(of course, it can also be invested in mutual funds and other liquid securities).When moving funds from your prior employer 401k, ensure that it is does as direct rollover "trustee-to-trustee," to avoid any tax issues.Once it's in your Solo 401k Plan, you'll be able to pursue most investments with all the tax advantages that you expect from a 401k plan.Some investments that are available in Self-Directed Solo 401k may result in taxable income to the 401k, not to you personally.

Being military we don’t have a lot of W2 income to work with so maybe building some equity and liquidating will work well, or maybe doing the BRRR thing will work better.

Sometimes it makes sense to have a liquidity event, I agree. 

Take responsibility for them - go to local grocery or hardware store and get an insecticide spray and get after them.

Personally, after paying off the student loans I'd invest most of your income in something more liquid than RE until you have a sizable nest egg to work with.  

Full liquidation of partnershipI feel like we've exhausted all of our options, but still are struggling with figuring out the perfect solution.

If you have liquidity and/or other issues, you would want to have a margin of safety built in.

By the time the 2008 crash, my partners and I decided to liquidate and go separate ways.