I have two scenarios I want to address:1) They fund 100% of the deal as a loan. and2) They want me to manage their money and invest it for them in real estate.What vehicle would I use to have them transfer me the money, without incurring taxes?

An rv is act actually a vehicle and is titled as a recreational vehicle.  

Then I miss out on seeingtheir vehicles and seeing how they are kept - a good clue as to how your property will be taken care of.

I really don't understand why the government requires someone to have a license to even explain a security, or an insurance policy or even a vehicle after so many transactions in one year to have a license to do so and not require any person transacting more than two RE transactions, of any kind, to have a license.

@Wayne Brooks, is there a vehicle whereby the agent can point out to the bank that the unit is "original" and the comps may be off?

However condo's can be a good investment depending on price you paid, appreciation potential, HOA's, and cash flow.The real problem you are having isn't your investment vehicle but rather your temperament and landlording style.

It was totally out of the blue, and it turned out to be a wonderful thing, and it was not even a secured loan.He [Mark] brings his vehicles in and tells us that if we ever need any help again to let him know.Okay, so he loaned us on an unsecured loan.

RE is the only investment vehicle whereby knowledge outperforms money each and every time.  

Lastly, is the landlord even legally justified to inconvenience tenants under a tenancy-at-will arrangement and force them to ruin their vehicle against their desires just to please another tenant who pays rent, since realistically he should repair the sprinkler system?

In additional to all other benefits mentioned above, Solo 401k is a great tax-sheltering vehicle, allowing you to shelter huge amount of money from taxes.When you use financing to acquire real estate in a SD IRA, the portion of the income from the property will be subject to UDFI tax (type of the UBIT of about 35%)!