Cheapskate temporary AC solution.

We usually don't use electrical hookups when camping, but will soon attend a trailer rally in the heat of summer that has hookups included, so we thought we would take advantage.

We didn't want to modify the trailer and already had a small window unit, so we bought this heater register box that fit perfectly over the AC outlet. 

https://www.homedepot.com/p/Master-Flow-12-in-x-2-1-4-in-to-6-in-90-Degree-Register-Box-90RB12X2-2X6/100151049

We bent out the edges into a flange and attached it with velcro tape so we could still use it as a window unit. 

We then attached a 6 inch dryer vent

https://www.amazon.com/gp/aw/d/B07BMFVKJ6?psc=1&ref=ppx_pop_mob_b_asin_title

 And connected it to the upper bunk window using a piece of birch and binder clip. 

 Final result is ghettotastic