It should still be under the 2-year warranty. With that many issues, I'd take it back. Make sure you have a complete list of problems so they can address them all in one trip.
My chairs have a strap to hold them steady during travel. Did your's not come equipped with them, or are you not using them? With them being all the way to the rear of a 32' trailer, they are going to move around quite a bit if they aren't strapped down - with the chair backs toward the front, so they can't beat against the window. (Love that rear picture window!!!)
I have the table and chairs option, so I don't have any storage beneath the dinette booth-type seats. But that should not be happening.
Also - is yours a fiberglass exterior, or do you have the aluminum siding. Mine is aluminum and I've had no problem with exterior trim. Maybe others can jump in here with their experiences.
2015 Jay Flight 32RLDS Elite
2012 Chevy 2500HD Crew Cab LTZ (6.6L Duramax/Allison)
Equalizer Hitch (1200# bars)