Help, air suspension, sunroof and NAV???

[PARAGON]

If you plan on putting any weight on or in the rear, get the air. It simply corrects the sag created by the additional weight and will make the truck handle better.

The top on the non-sunroof H2s is the same as ones with the sunroof. I am not completely sure about the ceiling but I checked into getting a double sunroof and I don't remember it cutting down on headroom.