I finnished installing additionall AC vents in the trailer today. Now I have 8 (peviously 4) in the livingroom/kitchen area, and 2 (previously 1) in the bedroom. Still have only one in the bathroom. Has good flow through all vents and, enough pressure to blow out the quick cool vent on the opposite end AC unit if only one is running. So actually 3 vents in the bedroom and 9 in the main area. I had a problem finding the same style vents that came from the factory that were able to close. I ended up using a slightly smaller vent (4.375" vs 5"), but the vent actually looks much less restrictive to flow. Same style vent that was on our last TT.
While I was at it I checked the rear AC unit mounting bolts. Yep, they were loose. So it tightened them up a little. Now in limited power conditions (30 amp or my Honda EU3000i) one AC unit should be able to cool the trailer much better.
Now onto the next project.