Those are more or less fit and finish issues, and are unfortunately consistent with what I have been seeing in "ultra-lite" towables at RV shows and factory showrooms the past two years. This has been a disappointment, because I've been out of the market for a while, and I had not been seeing this much of finish problem in 2004 - 2006, before the RV market collapsed. Now that I am thinking about something new to meet a changing need, I'm finding things that look to my like junk.
8-10 years ago, you could see a difference between lightweight and standard weight towable RVs, but then it was more a matter of flimsiness rather than assembly quality. For fit and finish, I was seeing differences between budget models and standard models from the same manufacturer, rather than a correlation with weight targets. There were a some really well made, premium priced lightweights on the market up to 2006, but people didn't buy them and those companies are gone.
There are still supposed to be some well-made lightweights out there. People rave about how happy they are with Lance. I don't get to see that product where I live, so I can't inspect them and judge for myself. I know of some molded trailers that are well made, but those are relatively expensive and come in sizes smaller than what most families want.
If you are looking for something constructed to be extremely lightweight, yet sturdy, finding it is going to be a struggle, particularly without paying premium prices. More often today, a premium price brings more features and glitz, rather than better construction quality.
Hearing of pieces falling off a lightweight suggests to me than someone failed to install the backing plates in the walls before lamination, the plates got put in the wrong place, the installer missed the plates when driving screws, or maybe the backers are simply not heavy enough. These things are all critical in laminated wall construction, particularly lightweights, since fasteners do not hold in luan or plastic foam. I know one manufacturer in early 2000s that was having trouble with assemblers missing the backing plates, screwing into nothing, but they got those assembly problems worked out, upgraded some of the engineering, and eventually re-positioned an entry level lightweight as a standard to premium model.
Where you are now in the scheme of things, you've been put into the position of product tester, and the dealer will have to remanufacture the stuff the guys at the factory did not make time to do right. I'm sort of surprised the blind didn't fall off on the 500 mile trip from factory to dealer rather than your shorter trip home. Maybe this model was small enough to transport on a flatbed, rather than being towed.
