What investments would be profitable for me?

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I am currently having to use the strategy of taking out commercial real estate loans (or mortgages) and using personal loans to fund the down payments. I am having trouble finding properties that will rent out for more than the combined loan payments, plus maintenance, taxes, etc.

I am only interested in houses, RV parks, mobile home parks, apartment complexes, and hotels. I think only the first three are within my reach right now.

What was your first profitable investment? What do you think I could buy using this strategy that would turn a profit? If I could find it once, I could find it 1000 times.