I decided that in order to intake cool air to flow across the compressor, I would create a plenum using half of the shelf and locate the intake vent about a foot from the exhaust vent. The shelf area is beside the wing on the outside.
The wing sits off the trailer a half inch.
I cut an opening and installed a grill that will be covered by the wing. I cut another opening for the exhaust and installed the hinge panel that used to be on the street side for the propane refrigerator access.
I put in some rails for the A/C unit to sit on and a temporary drain pan and am now in the testing stage. So far the unit works great but it has not been above 80 degrees during testing yet so... I wait.