I would definitely get the pass through window. The main advantage is being able to heat or cool the camper from the truck while driving. If you travel in freezing or very hot weather, you will greatly appreciate the difference.
I think Northstars are well made but my 2005 Igloo had a few issues. The paneling is really poor. The surface can easily abrade and wear. I do not know if they offer any options.
We had problems with our counter top. The substrate is pressboard that is not water resistant. There was a 45 degree bevel on the joints that exposed the substrate. With very little use, the water dampened the substrate and caused serious damage. Ask about getting a marine plywood countertop.
Next, I would look at the storage area under the sink. There is a fair amount of space but poorly laid out and hard to use. Using this for storage is risky because of exposed wiring, plumbing lines and pump and the need to keep open the electronic ventilation and fan. Lines from the bottom of the water tank and the drain cock are also unprotected.
Also think about the TV. We have never tried to use ours and rarely camp where there is a signal. Without the TV, there would be space for additional clothing storage.
