Could they improve build quality? I think so. Will they? Most likely not because they don't need to - they are better than most - sad as that is.
A few high end manufacturers incorporate torsion axles and disk brakes on their trailers. Northwood does not! Northwood's products have their own in-house frame and probably a little more insulation than most others. All the applicances, axles, tires, brakes, roof material and side gel/filon is basically the same as most other manufacturers. So what the customer really gets is a good frame and extra insulation. I think the OP is starting to figure that out. The rest is pretty standard stuff across the spectrum of RV trailers and is only as well built as the people putting it together.
