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Which way do I want the new fan motor to spin??  Red arrow??  Or blue arrow??

I think the fan blade is on backwards, if its like my big units, they pull air through the coil and push it out the bottom. Maybe this partly explains issues with this unit not working properly.

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Unless who ever previously replaced the motor put the fan on backwards.

Yup, I agree. 

Wonder if they got the right rotation motor?

So I was thinking this is how the airflow goes. Sucks it in from the area under the steps and blows it out the side??

So you have to think about these units as two units, inside and outside all in one package.The two coils are separate from each other when it cones to air flow. This is why they are generally called package units. 

So the fan blade you are looking at is the outside coil (condenser) it takes outside air and pulls it over the coil and dumps the heat outside. In this case I believe it pulls from the side and pushes the air down through the bottom grill of the unit, at least that is how my larger units work. You should notice a cut out in the floor of the bay to allow the air to be dumped out the bottom of the unit. 

The indoor portion (evaporator) takes air from inside the coach (under the stairs) and pulls it across the evaporator coil to remove the heat from the air and then forces it up through the ductwork back inside to the air registers, providing cooler air inside. This is most likely a squirrel cage fan (blower) for the inside unit. 

So as I said the air over the two coils is indoor air for the evaporator and outdoor air for the condenser, they are speperate from each other concerning air. The reason I say air is because the refrigerant is what is traveling between the two coils, this is the job of the compressors. They pull the refrigerant from the evaporator and push it through the condenser to transfer the heat from the indoor coil to the outdoor coil.


Here is a visual representation: