Allright so here are some pics of a mod in the works. Some pics are that of the "awsome" duct work...
. I took a photo with a pen cap for scale as to just how narrow these ducts are in providing airflow to the entire unit
. My mod is simple yet effective I hope in steering the air towards the ducts as opposed to being soley forced into them. The fan blows air directly down at the chill grill which creates turbulance and in turn causes some inefficient airflow IMHO. In my units case running 30 ft I need all the flow I can get. I fashioned this out of simple roofing flashing which is lightweight and flexible. It will be sealed with more metal tape. This mod also allows me to use the dump feature should I want to since the side vents are not blocked.
My unit has two ducts one either side of the chill grill which is why I have it peaked in the middle. One duct goes forward and the other aft to the bunk house. This could be used in almost any case of a ducted unit by just adjusting the placement of the peak to guide the air to the ducts as needed. I still have some work to do with taping and sealing before buttoning it all up but since there was some interest thought I would post the mod in progress.
This mod is untested as of today due to boondocking and no need for AC as of yet. I did notice a little increase in airflow from the ducts in the extreme locations so hopefully it will keep the unit cooler. Overall the install was sealed well at factory but needs some smoothing out to cut down on the turbulance with all the rough areas. Metal duct tape should help smooth this out along with some trimming of the foam which I started to install but did not complete due to time.