Didn't all the Old timers have fixed open vents on their trailers... A trick we used on Kustom Vans long ago , was to put a small vent (s) in the floor too ( with cover... boat parts) ... which when used with a top or side vent ( or cracked open window ) , created a positive airflow ... Warm air rising and exiting the higher vent , cool fresh air entering from the bottom ... Now one of the more scientifically inclined among us , can calculate the airflow through a (X) diameter vent and determine the flow rate/vent size sufficient to support life inside a trailer... only variable is how many cows are going to be in the barn ....
And I have to Totally Agree with Auntie on the good sleeping bag thing ...
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Good bag and you're ready for most anything ... Doesn't everybody have sleeping bags left over from the "tent camping" days ???