Well, it's in. I have left it in there and driven to work for the last two days in an attempt to get used to it. First, the Cummins is so powerful it hardly notices the extra 2,400 lbs. Second, sway is minimal as is sag. It may have dropped 1/2" at most in the back. If I didn't have the leveling kit in front, it would be sitting perfectly level.
My biggest concern was the sway. I have driven many motorhomes, 5th wheels, box trucks, and so on, and this has really good manners considering the weight.
For now I'm not going to think I need the airbags. However, add 2,700 lbs of ATVs/Trailer behind her, and I think I may want them. We'll see!
Thanks again for all the input! Snowman