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My last few trucks, I've put in an add-a-leaf. Not for the height, but because before I added the additional leaves, I tended to crack a leaf or two within a few years of using the truck. But I occasionally tow a very, very heavy trailer, so I figure the side sway pressure might have been doing it. Since I began adding a leaf about 15 years ago, I haven't cracked a single one.
It's an easy job, if the truck is pretty new, before the crud sets into the bolts.
And I've never measured, but it does add an inch or two to the height. I only add them to the rear. I've had F-250 SCs for a while now, I guess I could go to the 350, but, well, this is easy.