Ours came with the Firestone bags in the front coils. They deteriorated completely after about 6 or 7 years. I ended up installing the Air Lift brand because of good reviews and the lifetime warranty. In the 6 or so years they've been in place, i've never had to add any air. In case the OP wants another option, i'm pretty sure Air Lift has applications for the rear of vehicles.
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03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
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