Vehicle - 2001 4runnerUse - daily driver and car camping (roof top tent)Gear - 2 people worth of camping equipment, clothing and food.Skill level - former ASE Certified mechanicI installed per the provided instructions. I put 5 psi in them to verify they held air and they did. We have been camping twice. After being installed for only a month, one of the bags has a hole and will not hold air.*EDIT #1*I want to know "why" the bag will not hold air, so I will be removing the bad one and I will post again after to disclose what I find - even if it is something I did on install. I am wondering if there was a leak in one of the lines (at a connection point or at the plastic tee) which meant it was being run on less than the 5psi minimum recommended pressure... to be continued.*EDIT#2* (Saturday)Alrighty: I dug into the system and here is the result -We tested the system to find where it was leaking and narrowed it down to the passenger side. After jacking the vehicle up and pulling the spring/air bag we found there was a hole in the hose about six inches from where it connected to the bag. It appears to have been pinched somehow, but I'm not sure how/by what it was pinched. My current theory is that as the bags "break in" and are driven on, the volume of the system increases as the bags stretch and so the air pressure decreases. With reduced pressure in the system coupled with our camping gear and some off road driving (maybe the hose was a little longer that it needed to be), I believe it allowed the bag/hose to shift into a position where the hose could be pinched. Dang it! CHECK THE SYSTEM PRESSURE - EVERY DAY for the first week and EVERY WEEK for the first month. And adjust the pressure in the system as your weight load increases/decreases. We replaced the hose and aired up the system and went camping.*EDIT#3* (Sunday, yes the very next day)We woke up to flat air bags. Ok, so there is another, slower leak somewhere. We pumped up the system and headed home (about an hour). When we got home, the bags were flat again. More testing, the same procedure as yesterday, similar results - passenger side leaking. We pulled the spring/bag again, this time, we inflated the bag and dunked it in a bucket of water... yep, there is a hole in it (see pic). I am not sure if this happened when the system lost pressure previously, OR, if this is what caused the system to loose air pressure in the beginning; nor am I sure what caused the hole - it looks like a puncture more than a pinch, so maybe a rock or stick got thrown up in there, but who knows. I ordered a second set of bags to have them on hand so I could replace the damaged parts once they were identified, so I installed a new bag. The system is holding air and I am going to be keeping a close eye on it. Updates will follow.For now, I have updated my review from one star to 4 stars because the issue I have had does not appear to be product defect. As I use the vehicle I will update this review and will add/remove stars as is appropriate. Having finally driven my vehicle fully loaded with the Air Lift system properly inflated I'll say that I really do like the ride no more bouncing off the bump stops! The Air Lift 60743 1000 series system performs as advertised and I do recommend.