What kind of slob did that work?
My trailer had insulation blocking most of the air flow and there was no baffle at the top. It at least had the lower board installed correctly. This kind of work is par for the course.
You still do not have the lower baffle installed correctly and there is no top baffle guiding warm air from the top edge of the frige cabinet to the top of the outside vent. See the installation manual and do it right. While it works better now, it may not keep after under extreme conditions. Fridges installed in slides and utilizing side vents need all the help they can get.