2nd F250, 2nd set of Firestone Ride Rite's.
I like for my truck to have the normal stance that it would have when empty. I realize it isn't necessary, but I just prefer it. It feels better, it looks better, and the headlights fall on the road where they should.
After various iterations, I've put a 12V compressor under the hood, just forward of the battery. Quick-disconnects both to hold it down and to connect the air, plus an air gage right there to show what I've inflated to. Works great, very handy, and I can pull the compressor out for other jobs whenever needed. Got the additional parts for hookup from truckspring.com, including a check valve for just a few $$.