Welcome to the forums and congrats on getting your 377FL.
I have the 375FL, which is the prior version of the 377FL. It does not have the loft, everything else is pretty much identical.
Here's one thing you REALLY need to do to that model, and that is, reinforce the closet that runs across the back end. Put extra supports under the cloths rack. I promise you, that closet bar WILL collapse the first hard bump the trailer takes.
Here's a couple photos how I fixed mine (after it collapsed 3 different times and after 3 different attempts to simply re-secure it to the wall. Nope, those screws are screwed into Styrofoam.
Good luck. Ours collapsed on it's maiden voyage. What a mess, clothes all over the floor and nothing to screw the shelf back up with. The entire shelf collapsed.
But, my final fix has held up now for 5 years. No more issues there.
Good luck. Enjoy. Happy Camping!