Air bags are a progressive spring rate, the more they compress the more air pressure in them, and the higher spring rate, if you have tanks added to the bags it keeps the pressure more evenly throughout the mag and softer ride, but need lots of wheel travel.
and would add adjustable bumpstops, so if aired down to much and hit a big bump, tires will not rub, or if a emergency and a problem, can still get home.

The sleeve bag would need additional work due to the angle on lower control arms, I don't know how much angle they can work, maybe amake a wedged spacer.

The double convulated bag looks perfect for the rear

here are some from airbagit

#800
Sleeve Bag
Air Spring
Diameter 3.50"
Closed 6.00"
Ext. 10.00"
1500lbs /axle
150psi rate
$43

#2200
Double Convolute
Air Spring
Diameter 4.00"
Closed 2.8"
Extended 7.00"
1500lbs /axle
400psi rated
$76

#2200
Triple Convolute
Air Spring
Diameter 4.00"
Closed 3.4"
Extended 9.00"
1500lbs /axle
400psi rated
$98