How does a rental mortgage and rental income affect your debt ratio?

For instance:
Is it 00 rental income – 00 rental mortgage = 0 added to your income only

or

Is 00 of rental income added to your total income and 00 added to your total debt and they are considered separate of each other in the ratio?

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How car rental companies move their cars from one location to another?

I am working on an application and need to understand how car rental companies move their cars from one location to another when there are too many cars left by customers at one location. One way is to give dirt cheap one way rental offers to customers originating some specific location. However, I am trying to understand do they use auto transport companies to do this for them? If yes how much business auto transporters get one average from such scenarios?

Also, do car rental companies have some sort of contracts with auto transporters saying they will move rental cars always or on demand basis?

Thanks for your time!

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