Anyone running airbags in the rear coils?

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2015 Soul Red 6 Sport Auto 2016 Accord EX Auto
Our MZ5 is spending a lot of time at or near the weight limits of the vehicle. A lot more sag in the rear than the front. Does anyone have any experience with this kit:

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http://www.etrailer.com/susp-2012_Mazda_5.htm

I am looking to add this to our MZ5 if we do not get a new vehicle for the family hauling soon. Looking to run this and set up an onboard compressor and valving to automate this.
 
I've seen this kit on etrailer.com and am interested myself. When I first saw this kit the price was slightly lower, something like $89.99 and now it's basically $100. But, it's not like it'll be a major monetary investment if you try it and don't like it. As many of you may know from my posts on this forum, we have 2 Mazda5s (2008 and 2012). The 2008 has a Thule roof rack with fairing that we use for our roof box, bike rack, and kayak carrier from time to time. I was thinking that to complement the roof rack I'd install a trailer hitch on the 2012. If I did that, I'd want to also install this airbag kit and a transmission cooler on the 2012. Talk about a can of worms huh! My wife just rolls her eyes at me when I start talking about things I'd like to do with the cars.
 
That just seems... so cheap to be reliable?! But what do I know... I'd also like to hear if anyone has used this for a period of time and what their experience was like.
 
I need to look at an onboard compressor and switching setup before I do this. I have had Caddys and Lincolns with rear or four-corner air ride so I'm pretty familiar with what will be needed.
 
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