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Open up the air return vents on the ceiling across from one another and in line with the AC unit on the roof. Vents with the covers on them shown in the 1st pic. I took my phone and placed it inside the vent holes looking toward the centerline of the unit where the Ac is and took a couple pics. This is where you may see the ductwork collapsed and people are running PVC pipe lengthwise from the vent toward the AC in these ducts to open them up.
As you can see in my unit, a 2018.5 3791 RD, the factory was proactive in placing blocks of styrofoam in the ducts to prevent a collapse so I am good there. Pics need to be rotated 90 degrees the right with the screws facing up and down, sorry. However, one of the ducts in the bedroom was collapsed right at the end of the duct at the return vent. I simply placed an aluminum block I had laying around to open the duct more at that point and the flow increase was substantial in the bedroom and bath.
As well, we have the 4 air out vents on the ceiling in the kitchen pointed directly toward the ceiling fan. Cool air directed there spreads nicely throughout the kitchen and the elevated living room in our unit. It is 94 degrees here in the shade in southern Florida (though the RV is in direct sun) and with the moving cool air it is quite comfortable with the thermostat set at 78-80 degrees.
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