I'm a huge Fan of Air Bags. I also used them on a prior mid-size SUV when Towing. I measure to the bottom of my Towing Receiver on a flat surface before hitching up. I load up, and inflate the Air Bags back to that distance/level using a $50- stand-alone +12 VDC Air Compressor I carry anyway.
Improved Handling aside, they keep your Headlights aimed correctly; a big old deal here in Deer Country at Dusk. See the positive Comments in the Thread linked below.
I have Stock Handling when desired, and I avoid the rougher ride of an extra Leaf Spring when not Towing.
I also load up my Truck Bed sometimes to the point of 'needing' Air Bags.
My local 4x4 Shop suggested Firestones because - unlike the 'other' Air Bags reportedly selling a distant 2nd in the Market - Firestones have a circular Metal Top Plate [not Plastic].
I ordered my Firestone Set via Amazon. With the req'd heavy Brackets included, Free Shipping was another 'plus'.
Air Bag Installation Thread
Amazon Link ~ Firestone Air Bags