I have a 2007 GMC Acadia that I use to tow my car hauler with.  It does alright but because the trailer has a tongue weight that is a bit heavier than normal the Acadia has a bit of draggin' a$$.  No one (at least that I know of) makes a coil assist kit so I'm hoping you regulars can help. 

The i.d. of the rear coils is 4.33 inches and the compressed height is 8 inches.  Anyone know of a coil assist poly bag that will fit inside?  From there I can add a compressor, etc.

Thanks!

Airlift Part Number: 60816 is the one your after..