Thanks!
1. Correct. I put pool noodle inside the one next to the fridge and the other one closer to the bar as well so both runs are terminated just after those two vents. Don't do the bedroom as the rear AC is behind the vents.
2. In the living room, I simply removed the vent covers completely. They are just wide open now and didn't notice any decrease in flow at the other vents in the trailer afterwards so there seems to be plenty of air flow from the AC unit(s).
3. Magnets were from Amazon. Called: Hamilton Bowes #1 Strongest - RV & Trailer Magnetic Door/Baggage Door Catch Camper Black Plastic (2-Pair)
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I'm debating whether or not to do the magnet mod to the door in the back granting access to the under bed storage area as well, but I haven't hit my head on that one much yet, plus I'm not inside that one too often.