What you could do for maximum air flow in your trailer is have a set facing forward in the front of your trailer near the bottom of the side wall and then have another set facing rearward at the top back of the trailer.
Cargo trailer roof vent installation.
Most standard vents are 14 1 4 by 14 1 4 inches wide 14 x 14 inches wide or 13 x 14 inches wide.
Easy to use hand knob on vent housing allows you to lift and lower dome.
Just installing a rood vent in the enclosed trailer to keep it cool while working.
Bob livingston and bill gehr replace a weathered rv roof vent cover.
Since heat rises i would at the very least put a set of the trailer vents hmav2 avt2 near the top of the trailer to get the hottest air of the trailer out.
Most likely we have what you are looking for but you will need to first determine what vent you have on your trailer.
Thermostat controlled roof vent uses a variable speed reversible 12 volt fan to push stale air out of and pull fresh air into your rv camper or enclosed trailer.
Camp n 14 universal rv trailer camper motorhome roof vent cover vent lid replacement white 1 pack 4 6 out of 5 stars 2 209 20 97 20.