I have been trying to buy a toy hauler, and the first thing I look for is the windows. Several builders have nice winter packages, but they all leave out the windows (dual or thermo) I know an extra. But why would you build a 4 season class rv and leave them off?
I searched hard after having a 40'er long ago and placing towels in the windows for the drip. This time I'm looking at a cyclone 3812 built with the dual windows, even if your part time or in the hot areas of the country I would never leave them off. I'd rather add (if pre-wired) the generator or solar for later.
So in close I'm working with Lakeshore rv (John) and the windows, heat pump, bedroom slide, generator, 12 cu frig w/ice maker were my main goals and the price.