After purchasing an RV I wanted more stability in my half ton while towing so I bought the air lift 5000. The product was simple to install and the instructions were very clear for a non mechanic, took me 4 hrs to install. Just by appearance and feel I felt the push to connect fittings were cheap but time will tell, they've held up so far. I've towed with them twice so far and am still trying to figure out the perfect pressure but but overall I'm happy with the purchase.
Great product but my first shot at using these is a mixed review. I read the instructions 3 full times before beginning and sounded easy enough. Eventually I got the semi rusted bolts on my truck loose and things went well enough with the installation. I would suggest jacking up the back of your truck for space, I tried for several hours laying under my truck to do it without and it is a fools errand. Don't believe the hype for the little insulation sleeves to protect the air hoses...