I am surprised that your setup does not have vents built into the ceiling...
Mine has ceiling vents cut out in the foam between the roof and the ceiling that runs from one end of the trailer to the other.
Even my propane furnace uses floor mounted vents through out the trailer.
I have run all kinds of cabling through these vents which was pretty easy to do by pulling down the ceiling vents that are installed about every four feet or so and fishing the cable from one vent to the next. On both ends of my setup I have ceiling mounted cabinets so I can use this to gain access to ceiling vents and keep all of my cables hidden from view.
I figured all the of trailers did this...
My OFF-ROAD POPUP trailer does not have ceiling vents but of course it is only a 12-foot long box so the built-in vents of the roof mounted A/C does just fine...
I did look at a few photos on-line of your model and could not find any ceiling vents being shown in the many photos I found of your model.
I see a couple of spots where mounting a fan up high built-in the wall. Was looking at some of those at WALMART recent for a different project and the axial fans probably are not all that loud... One would want to get a DC Axial fan for the trailers so they would work off the batteries when not on shore power.
Something like this perhaps with a small louver vent on the other other side of the wall would move alot of air and return to the front room going under the door etc...
Lowes has these small round vents that can push into a hole in the wall and glue in place or use small screws... They also have some of the plastic air lover vents as well... I have some of these in use in OFF-ROAD trailer where I am moving warm air inside the cabinet areas that wrap around the floor area under the cabinet tops...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
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2005 Flagstaff 8528RESS