Firestone airbags in rear coil springs. Questions.

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I am going to install the Firestone air bags inside my stock coil springs. 2002 GMC Envoy, 4x4. The instructions show the air lines going out of the bottom. I see that as a potential problem with ground clearance. I do some offloading and picture the lines being damaged.

Does anyone use these air bags? How did you run the air lines? It looks like there is room to run the airlines out of the top.

Any suggestions? Thanks for any info.